74F779 Philips, 74F779 Datasheet - Page 2

• Manufacturer Part Number: 74F779
• Description: 8-bit bidirectional binary counter 3-State
• Manufacturer: Philips

FEATURES
DESCRIPTION
The 74F779 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 pine (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.
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
NOTE:
One (1.0) FAST Unit Load is defined as: 20 A in the High state and 0.6mA in the Low state.
Philips Semiconductors
1989 Sep 20
I/On
I/On
S0, S1
OE
CET
CP
TC
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 74F1779 for extended function version of the 74F799
8-bit bidirectional binary counter (3-State)
PINS
Data inputs
Data outputs
Select inputs
Output Enable input (active Low)
Count Enable Trickle input (active Low)
Clock input (active rising edge)
Terminal Count output (active Low)
DESCRIPTION
2
PIN CONFIGURATION
ORDERING INFORMATION
16-Pin Plastic SOL
16-Pin Plastic DIP
74F779
TYPE
DESCRIPTION
TYPICAL f
GND
I/O2
I/O3
I/O4
I/O5
I/O7
I/O1
I/O6
145MHz
1
2
3
4
5
6
7
8
COMMERCIAL RANGE
T
amb
V
MAX
CC
N74F779N
N74F779D
= 0 C to +70 C
HIGH/LOW
74F(U.L.)
= 5V 10%,
3.5/1.0
150/40
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
50/33
16
15
14
12
11
10
13
9
SUPPLY CURRENT
I/O0
CP
CET
V
TC
S0
S1
OE
CC
Product specification
TYPICAL
(TOTAL)
853–0385 97676
90mA
LOAD VALUE
3.0mA/24mA
1.0mA/20mA
74F779
70 A/0.6mA
20 A/0.6mA
20 A/0.6mA
20 A/0.6mA
20 A/0.6mA
HIGH/LOW
PKG DWG #
SOT 162-1
SOT38-4
SF01259