Texas Instruments CY74FCT244CTSOC, CY74FCT244CTQCT, CY74FCT244CTQC, CY74FCT244ATSOCT, CY74FCT244ATSOC Datasheet

SCCS017 - May 1994 - Revised February 2000

CY54/74FCT240T

CY54/74FCT244T

8-Bit Buffers/Line Drivers

Features

•Function, pinout, and drive compatible with FCT and F logic

•FCT-D speed at 3.6 ns max. (Com’l FCT244 only), FCT-C speed at 4.1 ns max. (Com’l),

FCT-A speed at 4.8 ns max. (Com’l)

•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

•Extended commercial range of −40˚C to +85˚C

• Sink current	64 mA (Com’l), 48 mA (Mil)
Source current	32 mA (Com’l), 12 mA (Mil)

Functional Description

The FCT240T and FCT244T are octal buffers and line drivers designed to be employed as memory address drivers, clock drivers, and bus-oriented transmitters/receivers. The 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.

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

Logic Block Diagram

FCT240T

OEA

OEB

DA0 OA0

OB0 DB0

												DA1											OA1
														1									DB1
												OB
												DA2												2
																							OA
														2									DB2
												OB
												DA3												3
																							OA
														3									DB3
												OB
																							FCT240T–1
Pin Configurations
																					DIP/SOIC/QSOP
						LCC																	Top View
					Top View
																					1				20
				3		2	2	1		1									OEA									VCC
					DA	OB	DA		OB	DA									DA0		2				19				OE	B
																				0	3				18					0
				8		7	6	5		4									OB										OA
																					4
			3																DA1						17			DB0
	OB			9						3
																OB0
GND																					5		FCT240T		16
				10															OB									OA
	DB3					FCT240T				2					DA0			1			6									1
				11						1									DA						15			DB
																OEA
																		2												1
	OA	3		12						20						VCC					7				14
																			OB2									OA2
	DB2
				13						19						OEB					8				13
																			DA3									DB2
				14		1516		17 18
																					9				12
							1 0												OB	3									OA	3
					2	1				0								GND			10				11			DB3
					OA	DB	OA	DB		OA
												FCT240T–2																FCT240T–3

FCT244T

A

OE

B

DA0

OE

OA0

OB0

DB0

DA1

OA1

OB1

DB1

DA2

OA2

OB2

DB2

DA3

OA3

OB3

DB3

FCT240T–4

DIP/SOIC/QSOP

LCC

Top View

Top View

1

20

3

2

2

1

1

OEA

VCC

OB

DA

DA

OB DA

DA0

2

19

OEB

3

18

8

7

6

5

4

OB0

OA0

4

OB3

9

3

OB0

DA1

17

DB0

5

FCT244T 16

GND

10

FCT244T

2

DA0

OB1

OA1

6

DB3

11

1

OE

A

DA2

15

DB1

OA3

12

20

VCC

OB2

7

14

OA2

DB2

13

19

OE

B

DA3

8

13

DB2

14

1516

17 18

OB3

9

12

OA3

0

2 1 1

0

GND

10

11

DB3

OA

DB

OA

DB

OA

FCT240T–5

FCT240T–6

Copyright © 2000, Texas Instruments Incorporated

CY54/74FCT240T

CY54/74FCT244T

]

Function Table FCT240T[1]

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

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
DC Output Current (Maximum Sink Current/Pin).......		120 mA

Electrical Characteristics Over the Operating Range

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Function Table FCT244T[1]

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

Power Dissipation ..........................................................	0.5W
Static Discharge Voltage............................................	>2001V
(per MIL-STD-883, Method 3015)

Operating Range

		Ambient
Range	Speed	Temperature	VCC
Commercial	DT	0°C to +70°C	5V ± 5%
Commercial	T, AT, CT	–40°C to +85°C	5V ± 5%
Military[4]	All	–55°C to +125°C	5V ± 10%

Parameter		Description		Test Conditions		Min.	Typ.[5]	Max.	Unit
VOH		Output HIGH Voltage	VCC=Min., IOH=–32 mA		Com’l	2.0			V
			VCC=Min., IOH=–15 mA		Com’l	2.4	3.3		V
			VCC=Min., IOH=–12 mA		Mil	2.4	3.3		V
VOL		Output LOW Voltage	VCC=Min., IOL=64 mA		Com’l		0.3	0.55	V
			VCC=Min., IOL=48mA		Mil		0.3	0.55	V
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	A
IIH		Input HIGH Current	VCC=Max., VIN=2.7V					±1	A
IIL		Input LOW Current	VCC=Max., VIN=0.5V					±1	A
IOZH		Off State HIGH-Level Output	VCC = Max., VOUT = 2.7V					10	A
		Current
IOZL		Off State LOW-Level	VCC = Max., VOUT = 0.5V					–10	A
		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	A

Notes:

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

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.

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CY54/74FCT240T

CY54/74FCT244T

]

Capacitance[6]

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

Power Supply Characteristics

Parameter	Description	Test Conditions					Typ.[5]	Max.	Unit
ICC	Quiescent Power Supply Current	VCC=Max., VIN≤0.2V,					0.1	0.2	mA
		VIN≥VCC–0.2V
ICC	Quiescent Power Supply Current	VCC=Max., VIN=3.4V,[8]					0.5	2.0	mA
	(TTL inputs)	f1=0, Outputs Open
ICCD	Dynamic Power Supply	VCC=Max., One Input Toggling,					0.06	0.12	mA/MHz
	Current[9]	50% Duty Cycle, Outputs Open,	OE	1=OE		2=GND,
		VIN≤0.2V or VIN≥VCC–0.2V
IC	Total Power Supply Current[10]	VCC=Max., 50% Duty Cycle, Outputs Open,					0.7	1.4	mA
		One Bit Toggling at f1=10 MHz,
		OE1=OE2=GND, VIN≤0.2V or VIN≥VCC–0.2V
		VCC=Max., 50% Duty Cycle, Outputs Open,					1.0	2.4	mA
		One Bit Toggling at f1=10 MHz,
		OE1=OE2=GND, VIN=3.4V or VIN=GND
		VCC=Max., 50% Duty Cycle, Outputs Open,					1.3	2.6[11]	mA
		Eight Bits Toggling at f1=2.5 MHz,
		OE1=OE2=GND, VIN≤0.2V or VIN≥VCC–0.2V
		VCC=Max., 50% Duty Cycle, Outputs Open,					3.3	10.6[11]	mA
		Eight Bits Toggling at f1=2.5 MHz,
		OE1=OE2=GND, VIN=3.4V or VIN=GND
Notes:

8.Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND.

9.This parameter is not directly testable, but is derived for use in Total Power Supply calculations.

10. IC	= IQUIESCENT + IINPUTS + IDYNAMIC
IC	= ICC+ ICCDHNT+ICCD(f0/2 + f1N1)
ICC	= Quiescent Current with CMOS input levels
ICC	= Power Supply Current for a TTL HIGH input (VIN=3.4V)
DH	= Duty Cycle for TTL inputs HIGH
NT	= Number of TTL inputs at DH
ICCD	= Dynamic Current caused by an input transition pair (HLH or LHL)
f0	= Clock frequency for registered devices, otherwise zero
f1	= Input signal frequency
N1	= Number of inputs changing at f1

All currents are in milliamps and all frequencies are in megahertz.

11. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.

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