74F269 8-Bit Bidirectional Binary Counter
April 2007
74F269
8-Bit Bidirectional Binary Counter
Features
■
Synchronous counting and loading
■
Built-in lookahead carry capability
■
Count frequency 100MHz
■
Supply current 113mA typ.
■
300mil slimline package
tm
General Description
The 74F269 is a fully synchronous 8-stage up/down
counter featuring a preset capability for programmable
operation, carry lookahead 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.
Ordering Information
Order
Number
74F269SC
74F269SPC
Package
Number
M24B
N24C
Package Description
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
Logic Symbols
Connection Diagram
IEEE/IEC
Function Table
PE
L
H
H
H
H
CEP CET U/D
X
H
X
L
L
X
X
H
L
L
X
X
X
H
L
CP
Function
Parallel Load All
Flip-Flops
Hold
Hold (TC Held High)
Count Up
Count Down
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= Transition LOW-to-HIGH
©1988 Fairchild Semiconductor Corporation
74F269 Rev. 1.0.2
www.fairchildsemi.com
74F269 8-Bit Bidirectional Binary Counter
Unit Loading/Fan Out
Pin Names
P
0
–P
7
PE
U/D
CEP
CET
CP
TC
Q
0
–Q
7
Description
Parallel Data Inputs
Parallel Enable Input (Active LOW)
Up-Down Count Control Input
Count Enable Parallel Input (Active LOW)
Count Enable Trickle Input (Active LOW)
Clock Input
Terminal Count Output (Active LOW)
Flip-Flop Outputs
U.L.
HIGH / LOW
1.0 / 1.0
1.0 / 1.0
1.0 / 1.0
1.0 / 1.0
1.0 / 1.0
1.0 / 1.0
50 / 33.3
50 / 33.3
Input I
IH
/ I
IL
Output I
OH
/ I
OL
20µA / -0.6 mA
20µA / -0.6mA
20µA / -0.6mA
20µA / -0.6mA
20µA / -0.6mA
20µA / -0.6 mA
-1mA / 20mA
-1mA / 20mA
©1988 Fairchild Semiconductor Corporation
74F269 Rev. 1.0.2
www.fairchildsemi.com
2
74F269 8-Bit Bidirectional Binary Counter
Logic Diagram
Figure 1.
©1988 Fairchild Semiconductor Corporation
74F269 Rev. 1.0.2
www.fairchildsemi.com
3
74F269 8-Bit Bidirectional Binary Counter
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
T
STG
T
A
T
J
V
CC
V
IN
I
IN
V
O
Storage Temperature
Parameter
Ambient Temperature Under Bias
Junction Temperature Under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage
(1)
Input Current
(1)
Voltage Applied to Output in HIGH State (with V
CC
=
0V)
Standard Output
3-STATE Output
Current Applied to Output in LOW State (Max.)
Rating
–65°C to +150°C
–55°C to +125°C
–55°C to +150°C
–0.5V to +7.0V
–0.5V to +7.0V
–30mA to +5.0mA
–0.5V to V
CC
–0.5V to +5.5V
twice the rated I
OL
(mA)
Note:
1. Either voltage limit or current limit is sufficient to protect inputs.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
T
A
V
CC
Free Air Ambient Temperature
Supply Voltage
Parameter
Rating
0°C to +70°C
+4.5V to +5.5V
©1988 Fairchild Semiconductor Corporation
74F269 Rev. 1.0.2
www.fairchildsemi.com
4
74F269 8-Bit Bidirectional Binary Counter
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
I
BVI
I
CEX
V
ID
I
OD
I
IL
I
OS
I
CCH
I
CCL
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW
Voltage
10% V
CC
5% V
CC
10% V
CC
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
Min.
2.0
Typ.
Max. Units
V
0.8
–1.2
V
V
V
0.5
5.0
7.0
50
V
µA
µA
µA
V
3.75
–0.6
µA
mA
mA
mA
mA
Min.
Min.
Min.
Max.
Max.
Max.
0.0
0.0
Max.
Max.
Max.
Max.
I
IN
=
–18mA
I
OH
=
–1mA
I
OL
=
20mA
V
IN
=
2.7V
V
IN
=
7.0V
V
OUT
= V
CC
I
ID
=
1.9µA, All Other Pins
Grounded
V
IOD
=
150mV, All Other Pins
Grounded
V
IN
=
0.5V
V
OUT
=
0.0V
V
O
=
HIGH
V
O
=
LOW
–60
104
113
4.75
2.5
2.7
Input HIGH Current
Input HIGH Current
Breakdown Test
Output HIGH Leakage
Current
Input Leakage Test
Output Leakage Circuit
Current
Input LOW Current
Output Short-Circuit
Current
Power Supply Current
Power Supply Current
–150
125
135
©1988 Fairchild Semiconductor Corporation
74F269 Rev. 1.0.2
www.fairchildsemi.com
5
工作这点儿事
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
