MC74F779D Просмотр технического описания (PDF) - Motorola => Freescale
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MC74F779D Datasheet PDF : 4 Pages
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8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
The MC74F779 is a fully synchronous 8-stage up/down counter with multi-
plexed 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 asynch-
ronous reset due to the possibility of decoding spikes.
• Multiplexed 3-State I/O Ports For Bus-oriented Applications
• Built-In Look-Ahead Carry Capability
• Count Frequency 145 MHz Typ
• Supply Current 90 mA Typ
• Fully Synchronous Operation
• Separate Pins for Master Reset and Synchronous Reset
• Center Power Pins to Reduce Effects of Package Inductance
• See F269 for 24-Pin Separate I/O Port Version
• See F579 for 20-Pin Version
• ESD Protection > 4000 Volts
PIN ASSIGNMENT
I/O0 CP CET VCC TC S0 S1 OE
16 15 14 13 12 11 10 9
MC74F779
8-BIT BIDIRECTIONAL
BINARY COUNTER (3-STATE)
16
1
16
1
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
1 2 3 4 56 78
I/O1 I/O2 I/O3 GND I/O4 I/O5 I/O6 I/O7
LOGIC SYMBOL
11 10
14 CET
15 CP
9 OE
S0 S1
TC 12
I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7
2345 6 789
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
74
74
I/O0–I/O7
74
TC
I/O0–I/O7
74
TC
FAST AND LS TTL DATA
4-252
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
MC74FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
Min
Typ
Max
Unit
4.5
5.0
5.5
V
0
25
70
°C
–3.0
mA
–1.0
24
mA
20
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