MC54-74HC390 Datasheet, PDF (1/8 Pages) ON Semiconductor – Dual 4-Stage Binary Ripple Counter with ÷2 and ÷5 Sections

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Dual 4-Stage Binary
Ripple Counter with
÷ 2 and ÷ 5 Sections
High–Performance Silicon–Gate CMOS
The MC54/74HC390 is identical in pinout to the LS390. The device inputs
are compatible with standard CMOS outputs; with pullup resistors, they are
compatible with LSTTL outputs.
This device consists of two independent 4–bit counters, each composed
of a divide–by–two and a divide–by–five section. The divide–by–two and
divide–by–five counters have separate clock inputs, and can be cascaded to
implement various combinations of ÷ 2 and/or ÷ 5 up to a ÷ 100 counter.
Flip–flops internal to the counters are triggered by high–to–low transitions
of the clock input. A separate, asynchronous reset is provided for each 4–bit
counter. State changes of the Q outputs do not occur simultaneously
because of internal ripple delays. Therefore, decoded output signals are
subject to decoding spikes and should not be used as clocks or strobes
except when gated with the Clock of the HC390.
• Output Drive Capability: 10 LSTTL Loads
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 to 6 V
• Low Input Current: 1 µA
• High Noise Immunity Characteristic of CMOS Devices
• In Compliance with the Requirements Defined by JEDEC Standard
No 7A
• Chip Complexity: 244 FETs or 61 Equivalent Gates
LOGIC DIAGRAM
1, 15
CLOCK A
÷2
COUNTER
3, 13 _QA
CLOCK B ^{4, 12}
÷5
COUNTER
5, 11
QB
6, 10
7, 9
QC
QD
2, 14
RESET
PIN 16 = VCC
PIN 8 = GND
MC54/74HC390
16
1
J SUFFIX
CERAMIC PACKAGE
CASE 620–10
16
1
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
16
1
D SUFFIX
SOIC PACKAGE
CASE 751B–05
ORDERING INFORMATION
MC54HCXXXJ
MC74HCXXXN
MC74HCXXXD
Ceramic
Plastic
SOIC
PIN ASSIGNMENT
CLOCK Aa 1
RESET a 2
QAa 3
CLOCK Ba 4
QBa 5
QCa 6
QDa 7
GND 8
16 VCC
15 CLOCK Ab
14 RESET b
13 QAb
12 CLOCK Bb
11 QBb
10 QCb
9 QDb
FUNCTION TABLE
Clock
AB
Reset Action
XX
X
X
H
Reset
÷ 2 and ÷ 5
L
Increment
÷2
L
Increment
÷5
10/95
© Motorola, Inc. 1995
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