MC74HC390A Datasheet, PDF (1/8 Pages) ON Semiconductor – Dual 4-Stage Binary Ripple Counter with ÷2 and ÷5 Sections

MC74HC390A
Dual 4-Stage Binary Ripple
Counter with ÷ 2 and ÷ 5
Sections
High–Performance Silicon–Gate CMOS
The MC74HC390A 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
HC390A.
• 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
CLOCK A ^{1, 15}
÷2
COUNTER
3, 13 _QA
CLOCK B ^{4, 12}
÷5
COUNTER
5, 11 _QB
6, 10
7, 9
QC
QD
RESET
2, 14
FUNCTION TABLE
Clock
AB
XX
X
X
Reset
H
L
L
Action
Reset
÷ 2 and ÷ 5
Increment
÷2
Increment
÷5
PIN 16 = VCC
PIN 8 = GND
http://onsemi.com
16
1
16
1
PDIP–16
N SUFFIX
CASE 648
SO–16
D SUFFIX
CASE 751B
MARKING
DIAGRAMS
16
MC74HC390AN
AWLYYWW
1
16
HC390A
AWLYWW
1
16
16
1
TSSOP–16
DT SUFFIX
CASE 948F
HC
390A
ALYW
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
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
ORDERING INFORMATION
Device
Package Shipping
MC74HC390AN
PDIP–16 2000 / Box
MC74HC390AD
SOIC–16 48 / Rail
MC74HC390ADR2
SOIC–16 2500 / Reel
MC74HC390ADT
TSSOP–16 96 / Rail
MC74HC390ADTR2 TSSOP–16 2500 / Reel
© Semiconductor Components Industries, LLC, 2000
1
March, 2000 – Rev. 2
Publication Order Number:
MC74HC390A/D