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參數(shù)資料
| 型號： | 74F1779 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-bit bidirectional binary counter -State |
| 中文描述： | 8位雙向二進制計數(shù)器國家 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 110K |
| 代理商： | 74F1779 |
Philips Semiconductors
Product specification
74F1779
8-bit bidirectional binary counter (3-State)
2
1989 Apr 06
853–1367 96245
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
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.
PIN CONFIGURATION
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
I/O1
I/O0
CP
CET
V
CC
TC
S0
S1
OE
I/O2
I/O3
GND
I/O4
I/O5
I/O7
I/O6
SF01259
TYPE
TYPICAL f
MAX
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F1779
130MHz
100mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
N74F1779N
PACKAGE
DRAWING
NUMBER
16-pin Plastic DIP
SOT38-4
16-pin Plastic SOL
N74F1779D
SOT162-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
I/On
Data inputs
3.5/1.0
70
μ
A/0.6mA
Data outputs
150/40
3.0mA/24mA
S0, S1
Select inputs
1.0/1.0
20
μ
A/0.6mA
20
μ
A/0.6mA
20
μ
A/0.6mA
20
μ
A/0.6mA
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
1.0mA/20mA
NOTE:
One (1.0) FAST unit load is defined as: 20
μ
A in the High state and 0.6mA in the Low state.
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