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Tables of Contents for Simplified Design of Microprocessor-Supervisory Circuits
Chapter/Section Title
Page #
Page Count
Preface
xiii
2
Acknowledgments
xv
1 The Microprocessor-Supervisory Functions
1
12
1.1 Power-On Reset
2
1
1.2 Low-Voltage (Glitch/Brownout) Reset
2
1
1.3 Memory-Write Protection
2
1
1.4 Power-Fail Warning
3
1
1.5 Battery-Backup Switchover
3
1
1.6 Watchdog Timer
4
1
1.7 Monitoring Multiple Power Supplies
4
1
1.8 Manual Reset
4
1
1.9 Parallel Outputs
5
1
1.10 Detailed Description of Internal Circuits
6
1
1.11 Battery-Switchover and V (OUT) Circuit Operation
6
3
1.12 Reset Output
9
1
1.13 Chip-Enable Gating and RAM Write Protection
10
1
1.14 1.3-V Comparator and Power-Fail Warning
11
1
1.15 Watchdog Timer and Oscillator
11
2
2 Multifunction 5-V Microprocessor-Supervisory Integrated Circuits
13
12
2.1 Basic Characteristics of MAX690A Series
15
1
2.2 Reset Output for MAX690A Series
15
4
2.3 Watchdog Input for MAX690A Series
19
1
2.4 Power-Fail Comparator for MAX690A Series
19
1
2.5 Backup-Battery Switchover for MAX690A Series
19
2
2.6 Using Capacitors as Backup Power Sources
21
1
2.7 Allowable Backup Power-Source Batteries
22
1
2.8 Operation without a Backup Power Source
22
1
2.9 Replacing the Backup Battery
22
1
2.10 Adding Hysteresis to the Power-Fail Comparator
22
1
2.11 Monitoring a Negative Voltage
23
1
2.12 Interfacing Microprocessors with Bidirectional Reset
23
2
3 3.0-V/3.3-V Microprocessor-Supervisory Integrated Circuits
25
14
3.1 Basic Characteristics of MAX690T/S/R Series
25
1
3.2 Reset Output for MAX690T/S/R Series
26
1
3.3 Reset Threshold for MAX690T/S/R Series
27
2
3.4 Watchdog Input for MAX690T/S/R Series
29
3
3.5 Power-Fail Comparator for MAX690T/S/R Series
32
1
3.6 Backup-Battery Switchover for MAX690T/S/R Series
32
1
3.7 Manual Reset for MAX690T/S/R Series
33
1
3.8 Short Circuit Problems for MAX690T/S/R Series
33
1
3.9 Capacitor Backup Power
34
1
3.10 Eliminating the Backup Power Source
34
1
3.11 Backup-Battery Replacement
34
1
3.12 Power-Fail Comparator Hysteresis
34
1
3.13 Monitoring an Additional Power Supply
35
1
3.14 Interfacing for Bidirectional Resets
36
1
3.15 Negative-Going V(CC) Transients
37
1
3.16 Basic Manual Reset Circuit with Battery Backup
37
2
4 Microprocessor-Supervisory Integrated Circuits with Chip-Enable
39
18
4.1 Basic Characteristics of MAX691A Series
39
1
4.2 General Description of MAX691A Series
39
1
4.3 RESET and RESET Outputs
40
4
4.4 The Watchdog Function
44
1
4.5 Watchdog Input
45
1
4.6 Watchdog Output
45
1
4.7 Alternative Watchdog and Reset Timeouts
46
1
4.8 Chip-Enable Signal Gating
47
1
4.9 Chip-Enable Input
48
1
4.10 Chip-Enable Propagation Delay
49
1
4.11 Chip-Enable Output
50
1
4.12 LOW LINE Output
50
1
4.13 Power-Fail Comparator
50
1
4.14 Power-Fail Input
50
1
4.15 Power-Fail Output
51
1
4.16 Battery-Backup Mode for MAX691A Series
51
1
4.17 Battery-On Output
52
1
4.18 Input Supply Voltage
52
1
4.19 Backup-Battery Input
52
1
4.20 Output Supply Voltage
52
1
4.21 General Application Notes for MAX691A Series
53
1
4.22 Capacitor Backup for MAX691A Series
53
1
4.23 Using Separate Supplies for V(BATT) and V(CC)
53
1
4.24 Alternative Chip-Enable Gating
54
1
4.25 Adding Hysteresis to the PFO
54
1
4.26 Negative Supply Voltages
54
2
4.27 Replacing the Backup Battery
56
1
4.28 Negative V(CC) Transients
56
1
5 Low-Cost Microprocessor-Supervisory Integrated Circuits with Battery Backup
57
12
5.1 Basic Characteristics of MAX703/704
57
2
5.2 General Description of MAX703/704
59
1
5.3 RESET Output for MAX703/704
59
3
5.4 Power-Fail Comparator for MAX703/704
62
1
5.5 Backup-Battery Switchover for MAX703/704
62
1
5.6 Manual Reset for MAX703/704
63
1
5.7 Using Capacitors for Backup
63
1
5.8 Backup Power Sources
64
1
5.9 Operating without Backup Power
65
1
5.10 Ensuring a Valid RESET Output Down to V(CC)=0
65
1
5.11 Battery Replacement
65
1
5.12 Adding Hysteresis
66
1
5.13 Negative Voltages
66
1
5.14 Reset with the Power-Fail Comparator
67
2
6 Low-Cost Microprocessor Supervisory Integrated Circuits with Watchdog
69
10
6.1 Basic Characteristics for MAX705 Series
69
2
6.2 General Description of MAX705 Series
71
1
6.3 Reset Output for MAX705 Series
71
1
6.4 Watchdog Timer for MAX705 Series
72
2
6.5 Manual Reset for MAX705 Series
74
1
6.6 Power-Fail Comparator for MAX705 Series
74
1
6.7 Valid RESET with A V(CC) of Zero
75
1
6.8 Monitoring Voltages Other Than Unregulated DC
76
1
6.9 Monitoring Negative Voltages
76
1
6.10 Bidirectional Reset
77
2
7 3-V Low-Cost Microprocessor-Supervisory Integrated Circuits
79
12
7.1 Basic Characteristics of MAX706/708
79
2
7.2 General Description of MAX706/708
81
1
7.3 RESET and RESET Outputs for MAX706/708
82
3
7.4 Watchdog Timer for MAX706P/R/S/T
85
1
7.5 Manual Reset for MAX706/708
86
1
7.6 Power-Fail Comparator for MAX706/708
86
1
7.7 Operation with +3-V and +5-V Supplies
86
1
7.8 Ensuring a Valid RESET Output Down to V(CC)=0 V
87
1
7.9 Adding Power-Fail Hysteresis
88
1
7.10 Monitoring Negative Voltages for MAX706/708
88
3
8 Complete Microprocessor-Supervisory Integrated Circuit
91
18
8.1 Basic Characteristics for MAX791
91
2
8.2 General Description for MAX791
93
2
8.3 Manual Reset Input
95
1
8.4 RESET Output for MAX791
96
3
8.5 Watchdog Function for MAX791
99
1
8.6 Watchdog Input for MAX791
99
1
8.7 Watchdog Output for MAX791
99
1
8.8 Watchdog-Pulse Output
99
1
8.9 Selecting an Alternative Watchdog Timeout
100
1
8.10 Chip-Enable Signal Gating
101
1
8.11 Chip-Enable Input for MAX791
101
1
8.12 Chip-Enable Output Impedance
102
1
8.13 LOW LINE Output
102
1
8.14 Power-Fail Comparator for MAX791
102
1
8.15 Battery-Backup Mode for MAX791
103
1
8.16 Output Supply Voltage for MAX791
104
1
8.17 Low-Battery Monitor for MAX791
105
1
8.18 Applications Considerations for MAX791
105
1
8.19 Using Capacitors with the MAX791
106
1
8.20 Operation with Separate Supplies for V(CC) and V(BATT)
106
1
8.21 Alternative Chip-Enable Gating for MAX791
107
1
8.22 Adding Hysteresis to the MAX791 Power-Fail Comparator
107
1
8.23 Monitoring Negative Voltages with the MAX791
107
1
8.24 Backup-Battery Replacement for the MAX791
108
1
9 Microprocessor and Nonvolatile Memory Supervisory Integrated Circuits
109
18
9.1 Basic Characteristics for MAX792/820
109
2
9.2 General Description of MAX792/820
111
2
9.3 Manual-Reset Input for MAX792/820
113
1
9.4 Monitoring a Regulated Supply
114
1
9.5 Monitoring a Supply with Internal Threshold
114
2
9.6 Monitoring a Supply with External Programming
116
3
9.7 Using the LOW LINE Output
119
1
9.8 Reset Function for MAX792/820
119
1
9.9 Reset Outputs for MAX792/820
120
1
9.10 Overvoltage Comparator for MAX792/802
120
1
9.11 Watchdog Function for MAX792/820
120
1
9.12 Watchdog Input for MAX792/820
121
1
9.13 Watchdog Output for MAX792/820
121
1
9.14 Consecutive Watchdog Faults
122
1
9.15 Alternative Watchdog Timeout Periods for MAX792/820
123
1
9.16 Chip-Enable Signal Gating
123
1
9.17 Chip-Enable Input for MAX792/820
123
1
9.18 Chip-Enable Output for MAX792/820
124
1
9.19 Applications Considerations for MAX792/820
125
1
9.20 Alternative Chip-Enable Gating for MAX792/820
125
1
9.21 Interfacing to Bidirectional Resets for MAX792/820
125
2
10 Simplified Design Approaches
127
102
10.1 MC6800 Interface with Resistive or Inductive Loads
127
1
10.2 MC68000 Interface with Resistive or Inductive Loads
127
1
10.3 Serial DRAM Nonvolatizer
128
2
10.4 Auxiliary Boost Supply for Microprocessor-Based Systems
130
1
10.5 RS-232 Transceiver for Microprocessor-Based Systems
130
3
10.6 Power Monitor for Microprocessor-Based Systems
133
1
10.7 Power Monitor for Microprocessor-Based Systems with Line Isolation
133
1
10.8 Line-Operated Power Monitor for Microprocessor-Based Systems
134
1
10.9 Low-Power Microprocessor Monitor with Push Button
134
1
10.10 Low-Power Microprocessor Monitor with Push Button and Watchdog Timer
135
1
10.11 Automatic Reset Integrated Circuit for Microprocessor-Based Systems
136
1
10.12 Microprocessor Power Monitor with Watchdog Timer and Push Button
137
1
10.13 Microprocessor Power Monitor with Early Warning
137
1
10.14 Memory Backup for SRAMs
138
1
10.15 Power Switching for SRAMs
139
1
10.16 Discrete-Component Watchdog Timer
140
1
10.17 Discrete-Component Power-On Reset
140
1
10.18 Microprocessor Supervisory Circuit Design Summary
141
2
10.19 Alternative Microprocessor-Supervisory Circuit Design Summary
143
1
10.20 Externally Adjustable Reset Threshold
144
1
10.21 Reset for Both Overvoltage and Undervoltage
144
1
10.22 Backup-Battery Monitor with Optional Test Load
145
1
10.23 Adding Hysteresis to the Power-Fail Circuit
145
1
10.24 Disabling the Watchdog under Program Control
146
1
10.25 Extending the Watchdog Timeout Period
147
1
10.26 Low-Cost Power-On Reset and Watchdog Controller
147
1
10.27 Power-Supply Monitor with Reset
147
1
10.28 Universal Voltage Monitors for Microprocessor-Based Systems
148
2
10.29 Quad Undervoltage Detector
150
1
10.30 Quad Undervoltage Detector with LED Indicators
150
1
10.31 Quad Overvoltage Detector with LED Indicators
150
1
10.32 Quad Undervoltage Detector with Single LED Indicator
151
2
10.33 Alternative Quad Overvoltage Detector
153
1
10.34 Overvoltage/Undervoltage Detector (Window Detector)
154
1
10.35 Dual-Negative Undervoltage Detector
155
1
10.36 Dual-Negative Overvoltage Detector
156
1
10.37 Negative Overvoltage-Undervoltage Detector (Window Detector)
156
2
10.38 Microprocessor Reset Circuit with Time Delay
158
1
10.39 Alternative Microprocessor Reset Circuit with Time Delay
159
1
10.40 Undervoltage Monitor for Low Voltage in Microprocessor Systems
159
1
10.41 Undervoltage Monitoring for 3.3-V Microprocessor-Based Systems
159
1
10.42 Dedicated Microprocessor Voltage Monitors
160
1
10.43 Undervoltage-Overvoltage Comparator
160
1
10.44 Monitoring the Supply for Overvoltage-Undervoltage
161
1
10.45 Voltage Monitor with Microprocessor Reset
161
1
10.46 Alternative Voltage Monitor with Microprocessor Reset
161
2
10.47 Nonvolatile RAM Controller
163
2
10.48 Three-Pin Microprocessor Reset Monitor
165
1
10.49 8051 Interface (LTC1090)
165
4
10.50 MC68HC05 Interface (LTC1090)
169
3
10.51 HD63705VO Interface (LTC1090)
172
2
10.52 COP820C Interface (LTC1090)
174
2
10.53 TMS7742 Interface (LTC1090)
176
3
10.54 COP402N Interface (LTC1090)
179
2
10.55 8051 Microprocessor Interface (LTC1091)
181
3
10.56 68HCO5 Interface (LTC1091)
184
2
10.57 COP82OC Interface (LTC1091 DAS)
186
2
10.58 TMS7742 Interface (LTC1091)
188
3
10.59 COP402N Interface (LTC1091)
191
2
10.60 HD63705 Interface (LTC1091)
193
3
10.61 TMS320C25 Interface
196
5
10.62 TMS320C25 Interface (LTC1091/92)
201
5
10.63 Z-80 Interface (LTC1090)
206
3
10.64 HD64180 Interface (LTC1090)
209
3
10.65 HA64180 Interface (LTC1091)
212
2
10.66 Interfacing to a Parallel Bus
214
3
10.67 8051 Microprocessor 12-Bit Interface
217
5
10.68 MC68HCO5 12-Bit Interface
222
2
10.69 TMS370 Interface
224
5
For Further Information
229
2
Index
231