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DS1236 Datasheet

  • DS1236

  • MocroManager Chip

  • 323.19KB

  • Dallas   Dallas

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DS1236
MicroManager Chip
www.dalsemi.com
FEATURES
Holds microprocessor in check during power
transients
Halts and restarts an out-of-control
microprocessor
Monitors pushbutton for external override
Warns microprocessor of an impending power
failure
Converts CMOS SRAM into nonvolatile
memory
Unconditionally write-protects memory when
power supply is out of tolerance
Consumes less than 100 nA of battery current
at 25擄C
Controls external power switch for high
current applications
Accurate 10% power supply monitoring
Optional 5% power supply monitoring
designated DS1236-5
Provides orderly shutdown in nonvolatile
microprocessor applications
Supplies necessary control for low-power
鈥渟top mode鈥?in battery operated hand-held
applications
Standard 16-pin DIP or space-saving 16-pin
SOIC
Optional industrial temperature range -40擄C
to +85擄C
PIN ASSIGNMENT
VBAT
VCCO
VCC
GND
PF
PF
WC/SC
RC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RST
RST
PBRST
CEI
CEO
ST
NMI
IN
VBAT
VCCO
VCC
GND
PF
PF
WC/SC
RCI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RST
RST
PBRST
CEI
CEO
ST
NMI
IN
16-Pin DIP (300-mil)
See Mech. Drawings Section
16-Pin SOIC (300-mil)
See Mech. Drawings Section
PIN DESCRIPTION
V
BAT
V
CCO
V
CC
GND
PF
PF
WC/
SC
RC
IN
NMI
ST
CEO
CEI
PBRST
RST
RST
- +3-Volt Battery Input
- Switched SRAM Supply Output
- +5-Volt Power Supply Input
- Ground
- Power-Fail (Active High)
- Power-Fail (Active Low)
- Wake-Up Control (Sleep)
- Reset Control
- Early Warning Input
- Non-Maskable Interrupt
- Strobe Input
- Chip Enable Output
- Chip Enable Input
- Pushbutton Reset Input
- Reset Output (Active Low)
- Reset Output (Active High)
DESCRIPTION
The DS1236 MicroManager Chip provides all the necessary functions for power supply monitoring, reset
control, and memory backup in microprocessor-based systems. A precise internal voltage reference and
comparator circuit monitor power supply status. When an out-of-tolerance condition occurs, the
microprocessor reset and power-fail outputs are forced active, and static RAM control unconditionally
write protects external memory. The DS1236 also provides early warning detection of a user-defined
threshold by driving a non-maskable interrupt. External reset control is provided by a pushbutton reset
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