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DS1236A Datasheet

  • DS1236A

  • MocroManager Chip

  • Dallas   Dallas

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DS1236A
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 DS1236A-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
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
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 DS1236A 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 DS1236A 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
1 of 20
111899

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