Fast CMOS Octal Buffer/Line Drivers
Description
PI74FCT244T/2244T PI74FCT541T/2541T
Fast CMOS Octal Buffer/Line Drivers
Features
• PI74FCT244/541T and PI74FCT2244/2541T are pin compatible with bipolar Fast Series at a higher speed and lower power consumption • 25Ω series resistor on all outputs (FCT2XXX only) • TTL input and output levels • Low ground bounce outputs • Extremely low static power • Hysteresis on all inputs • Industrial operating temperature range: –40°C to +85°C • Packaging (Pb-free & Green available): – 20-pin 173-mil wide plastic TSSOP (L) – 20-pin 209-mil wide plastic SSOP (H) – 20-pin 150-mil wide plastic QSOP (Q) – 20-pin 150-mil wide plastic TQSOP (R) – 20-pin 300-mil wide plastic SOIC (S) • Device models available upon request
Description
Pericom Semiconductor’s PI74FCT244T/541T and P174FCT2244/ 2541T are 8-bit wide driver circuits, designed to be used in applications requiring high-speed and high-output drive.
Ideal applications would include bus drivers, memory drivers, address drivers, and system clock drivers.
The PI74FCT541 and 2541T provide similar driver capabilities, but have their pins physically grouped by function.
All inputs are located on one side of the package, while outputs are on the opposite side, allowing for a much simpler and denser board layout.
All PI74FCT2XXX devices have a built-in 25Ω series resistor on all outputs to reduce noise because of reflections, thus eliminating the need for an external terminating resistor.
Block Diagrams
PI74FCT244/2244T
OEA
OEB* DA0 OB0 DA1 OB1 OA0 DB0
OA1 DB1 OA2 DB2 OA3 DB3
PI74FCT541/2541T
OEA
OEB
D0
O0
D1 D2 D3 D4 D5 D6 D7
O1
O2
O3
DA2 OB2 DA3 OB3
O4 O5 O6 O7
*OEB for 244T,
1
PS2011C
09/22/04
PI74FCT244T/2244T PI74FCT541T/2541T Octal Buffer/Line Drivers Product Pin Description
Pin Name OEA, OEB OEB(1) Dxx Oxx GND VCC Description 3-State Output Enable Inputs (Active LOW) 3-State Output Enable Input (Active HIGH) Inputs Outputs Ground Power
Truth Table
OEA L L H
Inputs(1) OEB OEB(2) L H L H H L
Outputs(1) D L H X 244...
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