8-BIT REGISTERED TRANSCEIVERS
CY54FCT646T, CY74FCT646T
8-BIT REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCCS031A – JULY 1994 – REVISED OCTOBER 2001
...
Description
CY54FCT646T, CY74FCT646T
8-BIT REGISTERED TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCCS031A – JULY 1994 – REVISED OCTOBER 2001
D Function, Pinout, and Drive Compatible
With FCT and F Logic
D Reduced VOH (Typically = 3.3 V) Versions
of Equivalent FCT Functions
D Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
D Ioff Supports Partial-Power-Down Mode
Operation
D Matched Rise and Fall Times D Fully Compatible With TTL Input and
Output Logic Levels
D ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
CY54FCT646T . . . D PACKAGE CY74FCT646T . . . Q OR SO PACKAGE
(TOP VIEW)
CPAB
SAB
DIR
A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10 11 12
24 VCC 23 CPBA
22 SBA
21 G
20 B1 19 B2 18 B3 17 B4 16 B5 15 B6 14 B7 13 B8
– 1000-V Charged-Device Model (C101)
D Independent Register for A and B Buses D CY54FCT646T
CY54FCT646T . . . L PACKAGE (TOP VIEW)
DIR SAB CPAB NC VCC CPBA SBA
– 48-mA Output Sink Current
– 12-mA Output Source Current
D CY74FCT646T
– 64-mA Output Sink Current
– 32-mA Output Source Current
D 3-State Outputs
4 3 2 1 28 27 26
A1 5
25 G
A2 6
24 B1
A3 7
23 B2
NC 8
22 NC
description
The ’FCT646T devices consist of a bus transceiver circuit with 3-state, D-type flip-flops,
A4 9
21 B3
A5 10
20 B4
A6 11
19 B5
12 13 14 15 16 17 18
A7 A8 GND NC B8 B7 B6
and control circuitry arranged for multiplexed
transmission of data directly from the input bus or
from the internal registers. Data o...
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