CY54FCT244T, CY74FCT244T
8-BIT BUFFERS/LINE DRIVERS
WITH 3-STATE OUTPUTS
SCCS071 – OCTOBER 2001
D
D
D
D
D
D
D
D
OEA
DA0
OB0
DA1
OB1
DA2
OB2
DA3
OB3
GND
1
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
VCC
OEB
OA0
DB0
OA1
DB1
OA2
DB2
OA3
DB3
20
2
11
CY54FCT244T . . . L PACKAGE
(TOP VIEW)
OB0
DA0
OEA
VCC
OEB
D
CY54FCT244T . . . D PACKAGE
CY74FCT244T . . . P, Q, OR SO PACKAGE
(TOP VIEW)
Function, Pinout, and Drive Compatible
With FCT and F Logic
Reduced VOH (Typically = 3.3 V) Versions
of Equivalent FCT Functions
Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
Ioff Supports Partial-Power-Down Mode
Operation
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
Matched Rise and Fall Times
Fully Compatible With TTL Input and
Output Logic Levels
CY54FCT244T
– 48-mA Output Sink Current
12-mA Output Source Current
CY74FCT244T
– 64-mA Output Sink Current
32-mA Output Source Current
3-State Outputs
DA1
OB1
DA2
OB2
DA3
4
3
2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
OA0
DB0
OA1
DB1
OA2
OB 3
GND
DB 3
OA 3
DB 2
D
description
The ’FCT244T devices are octal buffers and line drivers designed to be employed as memory address drivers,
clock drivers, and bus-oriented transmitters/receivers. These devices provide speed and drive capabilities
equivalent to their fastest bipolar logic counterparts, while reducing power consumption. The input and output
voltage levels allow direct interface with TTL, NMOS, and CMOS devices without external components.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2001, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
CY54FCT244T, CY74FCT244T
8-BIT BUFFERS/LINE DRIVERS
WITH 3-STATE OUTPUTS
SCCS071 – OCTOBER 2001
logic diagram (positive logic)
OEA
1
2
18
DA1
4
16
DA2
6
14
8
12
DA0
DA3
OEB
DB0
DB1
DB2
DB3
OA0
OA1
OA2
OA3
19
17
3
15
5
13
7
11
9
OB0
OB1
OB2
OB3
absolute maximum rating over operating free-air temperature range (unless otherwise noted)†
Supply voltage range to ground potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
DC input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
DC output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
DC output current (maximum sink current/pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mA
Package thermal impedance, θJA (see Note 1): P package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69°C/W
Q package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68°C/W
SO package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W
Ambient temperature range with power applied, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 135°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The package thermal impedance is calculated in accordance with JESD 51-7.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
