The MC74F269 is a fully synchronous 8-stage up/down counter featuring
a preset capability for programmable operation, carry look-ahead for easy
cascading and a U/D input to control the direction of counting. All state
changes, whether in counting or parallel loading, are initiated by the rising
edge of the clock.
•
Synchronous Counting and Loading
•
Built-In Lookahead Carry Capability
•
Count Frequency 115 MHz Typical
•
Supply Current 95 mA Typical
PIN ASSIGNMENT
PE
24
P0
23
P1
22
P2
21
P3
20
VCC
19
P4
18
P5
17
P6
16
P7
15
TC CET
14
13
24
1
8-BIT BIDIRECTIONAL
BINARY COUNTER
FAST™ SCHOTTKY TTL
J SUFFIX
CERAMIC
CASE 758-01
1
U/D
2
Q0
3
Q1
4
Q2
5
Q3
8
6
7
Q4 GND Q5
9
Q6
10
Q7
11 12
CP CEP
24
1
N SUFFIX
PLASTIC
CASE 724-03
24
1
DW SUFFIX
SOIC
CASE 751E-03
ORDERING INFORMATION
MC74FXXXJ
Ceramic
MC74FXXXN
Plastic
MC74FXXXDW SOIC
GUARANTEED OPERATING RANGES
Symbol
VCC
TA
IOH
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current
High
Output Current
Low
Parameter
74
74
74
74
Min
4.5
0
Typ
5.0
25
Max
5.5
70
–1.0
20
Unit
V
°C
mA
mA
FAST AND LS TTL DATA
4-138
MC74F269
FUNCTION TABLE
Inputs
Operating Mode
Parallel Load
Count Up
Count Down
Hold
Do Nothing
CP
↑
↑
↑
↑
↑
↑
U/D
X
X
h
l
X
X
CEP
X
X
l
l
h
X
CET
X
X
l
l
X
h
PE
l
l
h
h
h
h
Pn
l
h
X
X
X
X
Outputs
Qn
L
H
Count Up
Count Down
qn
qn
TC
(a)
(a)
(a)
(a)
(a)
H
H = HIGH voltage level steady state
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition
L = LOW voltage level steady state
l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition
X = Don’t care
q = Lower case letters indicate the state of the referenced output prior to the LOW-to-HIGH clock transition
↑
= LOW-to-HIGH clock transition
(a) = The TC is LOW when CET is LOW and the counter is at Terminal Count. Terminal Count Up is with all Qn outputs HIGH and Terminal Count Down is with all
(a) =
Qn outputs LOW.
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(Unless otherwise specified)
Limits
Symbol
VOH
VOL
VIK
IIH
IIL
IOS
ICC
Parameter
Output HIGH Voltage
Output LOW Voltage
Input Clamp Diode Voltage
Input HIGH Current
20
Input LOW Current
Output Short Circuit Current (Note 2)
Total Supply Current (total)
ICCH
ICCL
– 60
93
98
– 0.6
–150
120
mA
125
VCC = MAX
74
2.7
74
3.4
0.35
0.5
–1.2
100
V
V
µA
mA
mA
Min
2.5
V
IOH = –1.0 mA
Typ
Max
Unit
Test Conditions
VCC = 4.5 V
VCC = 4.75 V
IOL = 20 mA, VCC = 4.5 V
VCC = MIN, IIN = –18 mA
VCC = MAX
VIN = 7.0 V
VIN = 2.7 V
VCC = MAX, VIN = 0.5 V
VCC = MAX, VOUT = 0 V
(Note 3)
(Note 4)
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under guaranteed operating conditions for the applicable device type.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
