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UM82C8167A fiches techniques PDF

UMC - Real-Time Clock

Numéro de référence UM82C8167A
Description Real-Time Clock
Fabricant UMC 
Logo UMC 





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UM82C8167A fiche technique
(l)UMC
UM82C8167A
Real Time Clock (RTC)
Feature
• Microprocessor compatible (8-bit data bus)
• Milliseconds through month counters
• 56 bits of RAM with comparator to compare the real
time counter to the RAM data
• 2 INTERRUPT OUTPUTS with 8 possible interrupt
signals
• Single +5V power supply
• POWE R DOWN input that disables all inputs and
outputs except for one of the interrupts
• Status bit to indicate rollover during a read
• 32,768 Hz crystal oscillator
• Four-year calendar (no leap year)
• 24-hour clock
• 24 pin dual-in-line package
General Description
The UM82C8167A is a Si-gate CMOS LSI used as a real
time clock in micro system. This product includes an
addressable real time counter, 56 bits of static RAM and
two interrupt outputs. User can disable the chip from the
rest of the system for standby low power operation by
using of a POWER DOWN inpLIt. With an on chip
oscillation circuit, it can generate the 32,768 Hz time
base.
Pin Configuration
Block Diagram
cs
AD
WR
RDY
AO
A1
A2
A3
A4
OSC1
OSC2
Vss
VDD
POWER DOWN
D7
D6
D5
D4
D3
D2
D1
DO
STANDBY INTERRUPT
OUTPUT
INTERRUPT OUTPUT
Os
AD
R5Y
WR
POWER DOWN
D1
D2
D4
D5
I
7-187

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