Texas Instruments CY74FCT16245TPVCT, CY74FCT16245TPVC, CY74FCT16245TPACT, CY74FCT16245TPAC, CY74FCT16245ETPVCT Datasheet

Data sheet modified to remove devices not offered.				CY74FCT16245T
Data sheet acquired from Cypress Semiconductor Corporation.
				CY74FCT162245T
			CY74FCT162H245T
			16-Bit Transceivers
SCCS026 - July 1994 - Revised March 2000

Features

•FCT-E speed at 3.2 ns

•Power-off disable outputs permits live insertion

•Edge-rate control circuitry for significantly improved noise characteristics

•Typical output skew < 250 ps

•ESD > 2000V

•TSSOP (19.6-mil pitch) and SSOP (25-mil pitch) packages

•Industrial temperature range of –40˚C to +85˚C

•VCC = 5V ± 10%

CY74FCT16245T Features:

•64 mA sink current, 32 mA source current

•Typical VOLP (ground bounce)<1.0V at VCC = 5V, TA = 25˚C

CY74FCT162245T Features:

•Balanced output drivers: 24 mA

•Reduced system switching noise

•Typical VOLP (ground bounce) <0.6V at VCC = 5V, TA= 25˚C

CY74FCT162H245T Features:

•Bus hold on data inputs

•Eliminates the need for external pull-up or pull-down resistors

Functional Description

These 16-bit transceivers are designed for use in bidirectional synchronous communication between two buses, where high speed and low power are required. With the exception of the CY74FCT16245T, these devices can be operated either as two independent octals or a single 16-bit transceiver. Direction of data flow is controlled by (DIR), the Output Enable (OE) transfers data when LOW and isolates the buses when HIGH. The output buffers are designed with power off disable capability to allow for live insertion of boards.

The CY74FCT16245T is ideally suited for driving high-capacitance loads and low-impedance backplanes.

The CY74FCT162245T has 24-mA balanced output drivers with current limiting resistors in the outputs. This reduces the need for external terminating resistors and provides for minimal undershoot and reduced ground bounce. The CY74FCT162245T is ideal for driving transmission lines.

The CY74FCT162H245T is a 24-mA balanced output part that has bus hold on the data inputs. The device retains the input’s last state whenever the input goes to high impedance. This eliminates the need for pull-up/down resistors and prevents floating inputs.

Logic Block Diagrams CY74FCT16245T,CY74FCT162245T,

CY74FCT162H245T

1DIR

1OE

1A1

1B1

1A2

1B2

1A3

1B3

1A4

1B4

1A5

1B5

1A6

1B6

1A7

1B7

1A8

1B8

FCT16245–1

2DIR

2OE

2A1

2B1

2A2

2B2

2A3

2B3

2A4

2B4

2A5

2B5

2A6

2B6

2A7

2B7

2A8

2B8

FCT16245–2

Pin Configuration

SSOP/TSSOP

Top View

	1			48
1DIR						1OE
1B1	2			47		1A1
1B2	3			46		1A2
GND	4			45		GND
1B3	5			44		1A3
1B4	6			43		1A4
VCC	7		16245T	42		VCC
1B5	8		162245T	41		1A5
1B6	9		162H245T	40		1A6
GND	10			39		GND
1B7	11			38		1A7
1B8	12			37		1A8
2B1		13		36		2A1
2B2		14		35		2A2
GND		15		34		GND
2B3		16		33		2A3
		17		32
2B4						2A4
				31
VCC		18				VCC
2B5		19		30		2A5
2B6		20		29		2A6
GND		21		28		GND
2B7		22		27		2A7
2B8		23		26		2A8
2DIR						2
		24		25			OE

FCT16245–3

Copyright © 2000, Texas Instruments Incorporated

CY74FCT16245T

CY74FCT162245T

CY74FCT162H245T

Pin Description

	Name		Description
			Three-State Output Enable Inputs (Active LOW)
	OE
DIR			Direction Control
A			Inputs or Three-State Outputs[1]
B			Inputs or Three-State Outputs[1]

Maximum Ratings[3, 4]

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

Storage Temperature ........................	Com’l -55°C to +125°C
Ambient Temperature with	Com’l -55°C to +125°C
Power Applied....................................
DC Input Voltage ...........................................	–0.5V to +7.0V
DC Output Voltage.........................................	–0.5V to +7.0V

Function Table[2]

		Inputs
			DIR	Outputs
	OE
	L		L	Bus B Data to Bus A
	L		H	Bus A Data to Bus B
	H		X	High Z State

Notes:

DC Output Current
(Maximum Sink Current/Pin) ........................	–60 to +120 mA
Power Dissipation ..........................................................	1.0W
Static Discharge Voltage............................................	>2001V

(per MIL-STD-883, Method 3015)

Operating Range

	Ambient
Range	Temperature	VCC
Industrial	–40°C to +85°C	5V ± 10%

1.On CY74FCT162H245T these pins have bus hold.

2.H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care. Z = High Impedance.

3.Operation beyond the limits set forth may impair the useful life of the device. Unless otherwise noted, these limits are over the operating free-air temperature range.

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

Electrical Characteristics Over the Operating Range

Parameter		Description				Test Conditions		Min.	Typ.[5]	Max.	Unit
VIH		Input HIGH Voltage						2.0			V
VIL		Input LOW Voltage								0.8	V
VH		Input Hysteresis[6]							100		mV
VIK		Input Clamp Diode Voltage		VCC=Min., IIN=–18 mA					–0.7	–1.2	V
IIH		Input HIGH Current	Standard	VCC=Max., VI=VCC						±1	A
			Bus Hold							±100
IIL		Input LOW Current	Standard	VCC=Max., VI=GND						±1	A
			Bus Hold							±100	A
IBBH		Bus Hold Sustain Current on Bus Hold Input[7]		VCC=Min.			VI=2.0V	–50			A
IBBL
							VI=0.8V	+50
IBHHO		Bus Hold Overdrive Current on Bus Hold Input[7]		VCC=Max., VI=1.5V						TBD	mA
IBHLO
IOZH		High Impedance Output Current		VCC=Max., VOUT=2.7V						±1	A
		(Three-State Output pins)
IOZL		High Impedance Output Current		VCC=Max., VOUT=0.5V						±1	A
		(Three-State Output pins)
I	OS	Short Circuit Current[8]		V	CC	=Max., V	=GND	–80	–140	–200	mA
						OUT
IO		Output Drive Current[8]		VCC=Max., VOUT=2.5V				–50		–180	mA
I	OFF	Power-Off Disable		V	CC	=0V, V	≤4.5V[9]			±1	A
						OUT

2

CY74FCT16245T

CY74FCT162245T

CY74FCT162H245T

Output Drive Characteristics for CY74FCT16245T

Parameter	Description	Test Conditions	Min.	Typ.[5]	Max.	Unit
VOH	Output HIGH Voltage	VCC=Min., IOH=–3 mA	2.5	3.5		V
		VCC=Min., IOH=–15 mA	2.4	3.5		V
		VCC=Min., IOH=–32 mA	2.0	3.0		V
VOL	Output LOW Voltage	VCC=Min., IOL=64 mA		0.2	0.55	V

Output Drive Characteristics for CY74FCT162245T, CY74FCT162H245T

Parameter

Description

Test Conditions

Min.

Typ.[5]

Max.

Unit

I

ODL

Output LOW Current[8]

V

=5V, V

IN

=V

IH

or V

, V =1.5V

60

115

150

mA

CC

IL OUT

IODH

Output HIGH Current[8]

VCC=5V, VIN=VIH or VIL, VOUT=1.5V

–60

–115

–150

mA

VOH

Output HIGH Voltage

VCC=Min., IOH=–24 mA

2.4

3.3

V

VOL

Output LOW Voltage

VCC=Min., IOL=24 mA

0.3

0.55

V

Notes:

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

6.This parameter is specified but not tested.

7.Pins with bus hold are described in Pin Description.

8.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.

9.Tested at +25˚C.

Capacitance[6] (T = +25˚C, f = 1.0 MHz)
	A
Parameter	Description		Test Conditions	Typ.[5]	Max.	Unit
CIN	Input Capacitance	VIN = 0V		4.5	6.0	pF
COUT	Output Capacitance	VOUT = 0V		5.5	8.0	pF

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