74F269 查看數據表（PDF） - Philips Electronics
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74F269 Datasheet PDF : 14 Pages
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Philips Semiconductors
8–bit bidirectional binary counter
Product specification
74F269
FEATURES
• Synchronous counting and loading
• Built-in look-ahead carry capability
• Count frequency 115MHz typ
• Supply current 95mA typ
DESCRIPTION
The 74F269 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.
TYPE
74F269
TYPICAL fMAX
115MHz
TYPICAL
SUPPLY CURRENT
(TOTAL)
95mA
PIN CONFIGURATION
U/D 1
Q0 2
Q1 3
Q2 4
Q3 5
Q4 6
GND 7
Q5 8
Q6 9
Q7 10
CP 11
CEP 12
24 PE
23 P0
22 P1
21 P2
20 P3
19 VCC
18 P4
17 P5
16 P6
15 P7
14 TC
13 CET
SF00834
ORDERING INFORMATION
DESCRIPTION
24-Pin Plastic Slim DIP (300mil)
24-Pin Plastic SOL
24-Pin Plastic SSOP type II
COMMERCIAL RANGE
VCC = 5V ±10%, Tamb = 0°C to +70°C
N74F269N
N74F269D
N74F269DB
PKG DWG #
SOT222-1
SOT137-1
SOT340-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
P0 - P7
Parallel Data inputs
PE
Parallel Enable input (active Low)
U/D
Up/Down count control input
CEP
Count Enable Parallel input (active Low)
CET
Count Enable Trickle input (active Low)
CP
Clock input
TC
Terminal Count output (active Low)
Q0 - Q7
Flip-flop outputs
NOTE:
One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
74F(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
50/33
LOAD VALUE
HIGH/LOW
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
1.0mA/20mA
1.0mA/20mA
1996 Jan 05
2
853–0056 16186
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