SP703 SIPEX [Sipex Corporation], SP703 Datasheet - Page 4

• Manufacturer Part Number: SP703
• Description: Low Power Microprocessor Supervisory with Battery Switch-Over
• Manufacturer: SIPEX [Sipex Corporation]

PINOUT
PIN ASSIGNMENTS
Pin 1 —V
Pin 2 — V
Pin3 — GND — Ground reference for all signals
Pin 4 — PFI — Power-Fail Input. This is the
Pin 5 — PFO — Power-Fail Output.
Pin 6 — MR — Manual Reset Input. This input
Pin 7 — RESET (Active Low)– Reset Output.
SP703/704DS/07
GND
V
V
PFI
OUT
CC
connects to V
V
old. When V
V
connects to V
pacitor from V
noninverting input to the power-fail com-
parator. When PFI is less than 1.25V,
PFO goes low. Connect PFI to GND or
V
generates a reset pulse when pulled below
0.8V. This active LOW input is TTL/
CMOS compatible and can be shorted to
ground with a switch. It has an internal
250 A (typical) pull-up current. Leave
this pin floating when not used.
RESET Output goes low whenever
V
whenever MR is pulled below 0.8V for
longer than 150nS. RESET remains low
for 200ms after V
threshold voltage on power-up or after
being triggered by MR.
BATT
CC
OUT
CC
OUT
1
2
4
CC
3
is below the reset threshold, V
falls below the reset threshold or
when not used.
and V
— Output Supply Voltage. V
— +5V Supply Input
CC
CC
CC
BATT
OUT
is above the reset thresh-
when V
falls below V
. Connect a 0.1 F ca-
to GND.
CC
crosses the reset
CC
8
7
6
5
is greater than
SP703/704 Low Power Microprocessor Supervisory
RESET
V
PFO
MR
BATT
BATT
OUT
and
OUT
4
INTERNAL BLOCK DIAGRAM
Pin 8 — V
V
V
MR
PFI
BATT
CC
V
will be switched to V
20mV greater than V
20mV above V
nected to V
vents repeated switching if V
slowly.
CC
BATTERY SWITCHOVER
BATT
falls below the reset threshold, V
CIRCUITRY
— Backup-Battery Input. When
1.25V
CC
1.25V
. The 40mV hysteresis pre-
BATT
© Copyright 2000 Sipex Corporation
GENERATOR
, V
CC
RESET
OUT
. When V
OUT
will be recon-
if V
CC
BATT
CC
RESET
PFO
V
BATT
rises
falls
OUT
is