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ICM7170 Datasheet(PDF) 5 Page - Rochester Electronics

Part # ICM7170
Description  Microprocessor-Compatible, Real-Time Clock 8-Bit, uP Bus Compatible
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Manufacturer  ROCHESTER [Rochester Electronics]
Direct Link  http://www.rocelec.com/
Logo ROCHESTER - Rochester Electronics

ICM7170 Datasheet(HTML) 5 Page - Rochester Electronics

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ICM7170
Specification Number ICM7170_IM (IL) REV -
Page 5 of 14
4
AC Electrical Specifications TA = -40oC to 85oC, VDD = +5V ± 10%, VBACKUP = VDD,
D0 - D7 Load Capacitance = 150pF, VIL = 0.4V, VlH = 2.8V, Unless Otherwise Specified
PARAMETER
MIN
MAX
UNITS
READ CYCLE TIMING
READ to DATA Valid, tRD
-
250
ns
ADDRESS Valid to DATA Valid, tACC
-
300
ns
READ Cycle Time, tCYC
400
-
ns
Read High Time, tRH
150
-
ns
RD High to Bus Three-State, tRH
-
25
ns
ADDRESS to READ Set Up Time, tAS
50
-
ns
ADDRESS HOLD Time After READ, tAR
0
-
ns
WRITE CYCLE TIMING
ADDRESS Valid to WRITE Strobe, tAD
50
-
ns
ADDRESS Hold Time for WRITE, tWA
0
-
ns
WRITE Pulse Width, Low, tWL
100
-
ns
WRITE High Time, tWH
300
-
ns
DATA IN to WRITE Set Up Time, tDW
100
-
ns
DATA IN Hold Time After WRITE, tWD
30
-
ns
WRITE Cycle Time, tCYC
400
-
ns
MULTIPLEXED MODE TIMING
ALE Pulse Width, High, tLL
50
-
ns
ADDRESS to ALE Set Up Time, tAL
30
-
ns
ADDRESS Hold Time After ALE, tLA
30
-
ns
Timing Diagrams
FIGURE 1. READ CYCLE TIMING FOR NON-MULTIPLEXED BUS (ALE = VIH, WR = VIH)
A0 - A4, CS
RD
D0 - D7
ADDRESS VALID, CS LOW
tAR
OUTPUT DATA VALID
tACC
tRD
tAS
tRX
tCYC
ICM7170


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