N74F1779N 查看數據表（PDF） - Philips Electronics
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N74F1779N Datasheet PDF : 12 Pages
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Philips Semiconductors
8-bit bidirectional binary counter (3-State)
Product specification
74F1779
FEATURES
• Multiplexed 3-State I/O ports for bus oriented applications
• Built-in look-ahead carry capability
• Center power pins to reduce effects of package inductance
• Count frequency 145MHz typical
• Supply current 90mA typical
• See 74F269 for 24-pin separate I/O port version
• See 74F579 for 20-pin version
• See 74F779 for 16-pin version with abbreviated function table
PIN CONFIGURATION
I/O1 1
I/O2 2
I/O3 3
GND 4
I/O4 5
I/O5 6
I/O6 7
I/O7 8
16 I/O0
15 CP
14 CET
13 VCC
12 TC
11 S0
10 S1
9 OE
SF01259
DESCRIPTION
The 74F1779 is a fully synchronous 8-stage up/down counter with
multiplexed 3-State I/O ports for bus-oriented applications. All
control functions (hold, count up, count down, synchronous load) are
controlled by two mode pins (S0, S1). The device also features carry
look-ahead for easy cascading. All state changes are initiated by the
rising edge of the clock. When CET is High, the data outputs are
held in their current state and TC is held High. the TC output is not
recommended for use as a clock or asynchronous reset due to the
possibility of decoding spikes.
The 74F1779 differs from 74F779 in that it has an additional hold
mode as described in the Function Table.
TYPE
74F1779
TYPICAL fMAX
130MHz
TYPICAL
SUPPLY CURRENT
(TOTAL)
100mA
ORDERING INFORMATION
DESCRIPTION
16-pin Plastic DIP
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
N74F1779N
16-pin Plastic SOL
N74F1779D
PACKAGE
DRAWING
NUMBER
SOT38-4
SOT162-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
Data inputs
I/On
Data outputs
3.5/1.0
150/40
S0, S1
Select inputs
1.0/1.0
OE
Output Enable input (active Low)
1.0/1.0
CET
Count Enable Trickle input (active Low)
1.0/1.0
CP
Clock input (active rising edge)
1.0/1.0
TC
Terminal Count output (active Low)
50/33
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOAD VALUE
HIGH/LOW
70µA/0.6mA
3.0mA/24mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
1.0mA/20mA
1989 Apr 06
2
853–1367 96245
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