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Intersil Electronic Components Datasheet



ICM7170

Microprocessor-Compatible / Real-Time Clock



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ICM7170 pdf
ICM7170
August 1997
Microprocessor-Compatible, Real-Time Clock
[ /Title
(ICM7
170)
/Sub-
ject
(Micro
proces-
sor-
Com-
pati-
ble,
Real-
Time
Clock)
/Autho
r ()
/Key-
words
(Inter-
sil
Corpo-
ration,
Real
Time
Clock,
Bat-
tery
Backu
p,
Inter-
nal
Oscil-
lator,
Micro-
proces-
sor
inter-
face,
Data
Features
Description
• 8-Bit, µP Bus Compatible
- Multiplexed or Direct Addressing
• Regulated Oscillator Supply Ensures Frequency
Stability and Low Power
• Time From 1/100 Seconds to 99 Years
• Software Selectable 12/24 Hour Format
• Latched Time Data Ensures No Roll Over During Read
• Full Calendar with Automatic Leap Year Correction
• On-Chip Battery Backup Switchover Circuit
• Access Time Less than 300ns
• 4 Programmable Crystal Oscillator Frequencies Over
Industrial Temperature Range
• 3 Programmable Crystal Oscillator Frequencies Over
Military Temperature Range
• On-Chip Alarm Comparator and RAM
• Interrupts from Alarm and 6 Selectable Periodic
Intervals
• Standby Micro-Power Operation: 1.2µA Typical at 3.0V
and 32kHz Crystal
Applications
• Portable and Personal Computers
• Data Logging
• Industrial Control Systems
• Point Of Sale
Ordering Information
TEMP. RANGE
PART NUMBER
(oC)
PACKAGE
ICM7170IPG
-40 to 85 24 Ld PDIP
PKG.
NO.
E24.6
The ICM7170 real time clock is a microprocessor bus
compatible peripheral, fabricated using Intersil’s silicon gate
CMOS LSl process. An 8-bit bidirectional bus is used for the
data I/O circuitry. The clock is set or read by accessing the 8
internal separately addressable and programmable counters
from 1/100 seconds to years. The counters are controlled by
a pulse train divided down from a crystal oscillator circuit,
and the frequency of the crystal is selectable with the on-
chip command register. An extremely stable oscillator
frequency is achieved through the use of an on-chip
regulated power supply.
The device access time (tACC) of 300ns eliminates the need
for wait states or software overhead with most
microprocessors. Furthermore, an ALE (Address Latch
Enable) input is provided for interfacing to microprocessors
with a multiplexed address/data bus. With these two special
features, the ICM7170 can be easily interfaced to any
available microprocessor.
The ICM7170 generates two types of interrupts, periodic and
alarm. The periodic interrupt (100Hz, 10Hz, etc.) can be
programmed by the internal interrupt control register to
provide 6 different output signals. The alarm interrupt is set
by loading an on-chip 51-bit RAM that activates an interrupt
output through a comparator. The alarm interrupt occurs
when the real time counter and alarm RAM time are equal. A
status register is available to indicate the interrupt source.
An on-chip Power Down Detector eliminates the need for
external components to support the battery back-up
function. When a power down or power failure occurs,
internal logic switches the on-chip counters to battery back-
up operation. Read/write functions become disabled and
operation is limited to time-keeping and interrupt generation,
resulting in low power consumption.
Internal latches prevent clock roll-over during a read cycle.
Counter data is latched on the chip by reading the
100th-seconds counter and is held indefinitely until the
counter is read again, assuring a stable and reliable time
value.
ICM7170IDG
-40 to 85 24 Ld SBDIP
D24.6
ICM7170IBG
-40 to 85 24 Ld SOIC
M24.3
ICM7170MDG
-55 to 125 24 Ld SBDIP
D24.6
ICM7170AIPG
-40 to 85 24 Ld PDIP
E24.6
ICM7170AIDG
-40 to 85 24 Ld SBDIP
D24.6
ICM7170AIBG
-40 to 85 24 Ld SOIC
M24.3
ICM7170AMDG -55 to 125 24 Ld SBDIP
D24.6
NOTE: “A” Parts Screened to <5µA ISTBY at 32kHz.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
12-5
File Number 3019.3



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ICM7170 pdf
Pinouts
ICM7170
(PDIP, SBDIP)
TOP VIEW
WR 1
ALE 2
CS 3
A4 4
A3 5
A2 6
A1 7
A0 8
OSC OUT 9
OSC IN 10
INT SOURCE 11
INTERRUPT 12
24 RD
23 VDD
22 D7
21 D6
20 D5
19 D4
18 D3
17 D2
16 D1
15 D0
14 VBACKUP
13 VSS (GND)
ICM7170
ICM7170
(SOIC)
TOP VIEW
A1 1
A0 2
OSC OUT 3
OSC IN 4
INT SOURCE 5
INT 6
VSS 7
VBACKUP 8
D0 9
D1 10
D2 11
D3 12
24 A2
23 A3
22 A4
21 CS
20 ALE
19 WR
18 RD
17 VDD
16 D7
15 D6
14 D5
13 D4
Functional Block Diagram
24
RD
1
WR
2
µP
ALE
CONTROL
3
CS
VDD
VBACKUP
VSS
23
14
13
POWER
SUPPLY
CONTROL
OSCILLATOR
CRYSTAL
OSC OSC
OUT IN
9 10
LOW
POWER
OSC
INTERRUPTS
PERIODIC
COMPARE
TIME COUNTERS
0.01 SEC MIN HOUR DAY DATE MON YEAR
8
8-BIT BUS
8
12
INT
INT
11 SOURCE
THREE-STATE
I/O
DRIVERS
8
DATA I/O
D0 - D7
15 - 22
ADDRESS
INPUTS
A0 - A4
5
8-4
ADDRESS
LATCHES
0.01 SEC MIN HOUR DAY DATE MON YEAR
COMPARE RAM
CMD
REG
STATUS
REG
INTER
MASK
REG
12-6



Part Number ICM7170
Description Microprocessor-Compatible / Real-Time Clock
Maker Intersil Corporation - Intersil Corporation
Total Page 13 Pages
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