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參數資料
| 型號： | CY5474FCT646T |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-Bit Registered Transceiver |
| 中文描述： | 8位注冊收發器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 76K |
| 代理商： | CY5474FCT646T |
8-Bit Registered Transceiver
CY54/74FCT646T
SCCS031 - July 1994 - Revised March 2000
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
Copyright
2000, Texas Instruments Incorporated
Features
Function, pinout, and drive compatible with FCT and
F logic
FCT-C speed at 5.4 ns max. (Com’l)
FCT-A speed at 6.3 ns max. (Com’l)
Reduced V
(typically = 3.3V) versions of equivalent
FCT functions
Edge-rate control circuitry for significantly improved
noise characteristics
Power-off disable feature permits live insertion
Matched rise and fall times
Fully compatible with TTL input and output logic levels
ESD > 2000V
Sink current
64 mA (Com’l), 48 mA (Mil)
Source current
32 mA (Com’l), 12 mA (Mil)
Independent register for A and B buses
Extended commercial range of
40C to +85C
Functional Description
The FCT646T consists of a bus transceiver circuit with
three-state, D-type flip-flops, and control circuitry arranged for
multiplexed transmission of data directly from the input bus or
from the internal registers. Data on the A or B bus will be
clocked into the registers as the appropriate clock pin goes to
a HIGH logic level. Enable Control G and direction pins are
provided to control the transceiver function. In the transceiver
mode, data present at the high-impedance port may be stored
in either the A or B register, or in both. The select controls can
multiplex stored and real-time (transparent mode) data. The
direction control determines which bus will receive data when
the enable control G is Active LOW. In the isolation mode
(enable Control G HIGH), A data may be stored in the B reg-
ister and/or B data may be stored in the A register.
The outputs of the FCT646T are designed with a power-off
disable feature to allow for live insertion of boards.
Logic Block Diagram
Pin Configurations
C
D
B
1
28
27
26
4
3
2
1
5
6
7
8
9
10
13
14
15
16
17
18
25
24
23
22
21
20
11
12
19
A3
A
A
B2
B5
B1
N
N
B4
A
LCC
Top View
B3
C
D
A
1
TO 7 OTHER CHANNELS
SAB
CPAB
CPBA
SBA
DIR
G
V
CC
CPBA
SBA
CPAB
NC
A
7
A
8
B
6
B
7
B
8
SAB
DIR
A
A
G
NC
GND
Function Block Diagrams
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
24
23
22
21
13
14
V
CC
CPBA
15
QSOP, SOIC
Top View
CPAB
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
SAB
DIR
SBA
G
GND
CPAB
SAB
DIR
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
CPBA
SBA
G
Pin Description
Name
Description
A
B
CPAB, CPBA
SAB, SBA
DIR, G
Data Register A Inputs, Data Register B Outputs
Data Register B Inputs, Data Register A Outputs
Clock Pulse Inputs
Output Data Source Select Inputs
Output Enable Inputs
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