Texas Instruments CY74FCT2541CTSOCT, CY74FCT2541CTSOC, CY74FCT2541CTQCT, CY74FCT2541CTQC, CY74FCT2541ATSOCT Datasheet

Data sheet acquired from Cypress Semiconductor Corporation.

Data sheet modified to remove devices not offered.

CY74FCT2541T

SCCS041 - September 1994 - Revised March 2000

Features

•Function and pinout compatible with FCT and F logic

•FCT-C speed at 4.1 ns max. FCT-A speed at 4.8 ns max.

•25Ω output series to reduce transmission line reflection noise

•Reduced VOH (typically = 3.3V) versions of equivalent FCT functions

•Edge-rate control circuitry for significantly improved noise characteristics

•Power-off disable feature

•ESD > 2000V

•Matched rise and fall times

•Fully compatible with TTL input and output logic levels

• Sink current	12 mA
Source current	15 mA

8-Bit Buffer/Line Driver

•Extended commercial temp. range of –40˚C to +85˚C

•Three-state outputs

Functional Description

The FCT2541T is an octal buffer and line driver designed to be employed as a memory address driver, clock driver, and bus-oriented transmitter/receiver. On-chip termination resistors have been added to the outputs to reduce system noise caused by reflections. The FCT2541T can be used to replace the FCT541T to reduce noise in an existing design. The speed of the FCT2541T is comparable to bipolar logic counterparts while reducing power dissipation. The input and output voltage levels allow direct interface with TTL and CMOS devices without external components.

The outputs are designed with a power-off disable feature to allow for live insertion of boards.

	Logic Block Diagram		Pin Configurations
	OEA	OEB		SOIC/QSOP
				Top View
	D0	O0	OEA	1	20	VCC
	D1	O1	D0	2	19	OE B
			D1	3	18	O0
	D2	O2	D2	4	17	O1
	D3	O3	D3	5	16	O2
			D4	6	15	O3
	D4	O4	D5	7	14	O4
	D5	O5	D6	8	13	O5
			D7	9	12	O6
	D6	O6	GND	10	11	O7
	D7	O7			FCT2541T–2
		FCT2541T–3

]

Function Table[1]

			Inputs
		A			B	D	Output
	OE			OE
	L			L		L	L
	L			L		H	H
	H			H		X	Z

Note:

1.H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care

Z = High Impedance

Copyright © 2000, Texas Instruments Incorporated

CY74FCT2541T

Maximum Ratings[2,3]

(Above which the useful life may be impaired. For user guidelines, not tested.)

Storage Temperature .....................................	−65°C to +150°C
Ambient Temperature with	−65°C to +135°C
Power Applied ..................................................
Supply Voltage to Ground Potential..................	−0.5V to +7.0V
DC Input Voltage .................................................	−0.5V to +7.0V
DC Output Voltage ..............................................	−0.5V to +7.0V

Electrical Characteristics Over the Operating Range

DC Output Current (Maximum Sink Current/Pin) ......	120 mA
Power Dissipation ..........................................................	0.5W
Static Discharge Voltage............................................	>2001V

(per MIL-STD-883, Method 3015)

Operating Range

	Ambient
Range	Temperature	VCC
Commercial	−40°C to +85°C	5V ± 5%

Parameter		Description		Test Conditions		Min.	Typ.[5]	Max.	Unit
VOH		Output HIGH Voltage	VCC = Min., IOH = −15 mA			2.4	3.3		V
VOL		Output LOW Voltage	VCC = Min., IOL = 12 mA				0.3	0.55	V
ROUT		Output Resistance	VCC = Min., IOL = 12 mA			20	25	40	Ω
VIH		Input HIGH Voltage				2.0			V
VIL		Input LOW Voltage						0.8	V
VH		Hysteresis[6]	All inputs				0.2		V
VIK		Input Clamp Diode Voltage	VCC = Min., IIN = −18 mA				−0.7	−1.2	V
II		Input HIGH Current	VCC = Max., VIN = VCC					5	µA
IIH		Input HIGH Current	VCC = Max., VIN = 2.7V					±1	µA
IIL		Input LOW Current	VCC = Max., VIN = 0.5V					±1	µA
IOZH		Off State HIGH-Level	VCC = Max., VOUT = 2.7V					15	µA
		Output Current
IOZL		Off State LOW-Level	VCC = Max., VOUT = 0.5V					−15	µA
		Output Current
I	OS	Output Short Circuit Current[7]	V	= Max., V	= 0.0V	−60	−120	−225	mA
			CC	OUT
IOFF		Power-Off Disable	VCC = 0V, VOUT = 4.5V					±1	µA

Capacitance[6]

Parameter	Description	Typ.[5]	Max.	Unit
CIN	Input Capacitance	5	10	pF
COUT	Output Capacitance	9	12	pF
Notes:

2.Unless otherwise noted, these limits are over the operating free-air temperature range.

3.Unused inputs must always be connected to an appropriate logic voltage level, preferably either VCC or ground.

4.TA is the “instant on” case temperature.

5.Typical values are at VCC=5.0V, TA=+25˚C ambient.

6.This parameter is specified but not tested.

7.Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter tests, IOS tests should be performed last.

2