CY74FCT16646ATPAC - Cypress Semiconductor

16-Bit Registered Transceiver

ax id: 7043

CY74FCT16646T

CY74FCT162646T

Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600

ust 1994 - Revised Oc tober 30

1997

646T

Features

• Low pow er, pin-compatible replacement for ABT

functions

• FCT-E speed at 3.8 ns

• Power-off disable outputs permits live insertion

• Edge-rate control cir cuit ry for signif icant ly improved

noise characteristics

• Typical out put skew < 250 ps

• ESD > 2000V

• TSSOP (19.6 -mil pit ch) and SSOP (25-mil pitch)

packages

• Industrial temperature range of −40°C to +85°C

•V

CC = 5V ± 10%

CY74FCT16646T Features:

• 64 mA sink current, 32 mA source current

• Typical VOLP (ground bounce) <1.0V at VCC = 5V,

TA = 25°C

CY74FCT162646T Features:

• Balanced 24 mA output dri vers

• Red uced system switching noise

• Typical VOLP (ground bounce) <0.6V at VCC = 5V,

TA= 2 5° C

Functional Descripti on

The CY74FCT16646T and CY74FCT162646T 16-bit trans-

ceivers are three-state, D-type registers, and control circuitry

arra nged f or mul tip le x ed tr ansmi ssion of d ata direct ly fr om the

input bus or from the internal registers. Data on the A or B bus

will be clocked into the registers as the appropriate clock pin

goes to a HIGH logic level. Output Enable (OE) and direction

pins (DIR) are provided to control the transceiver function. In

the tr ansceiv er mode, dat a present at t he high impedance po rt

may be stored in either the A or B register, or in both. The

select con trol s can mu lti ple x st ored and r eal- tim e (tr anspa rent

mode) data. The direction control determines which bus will

receive data when the Output Enable (OE) is Ac tive L OW. In

the i solat ion mode ( Out put Ena ble (OE ) HIGH), A data ma y be

stored in the B register and/or B data may be stored in the A

able featur e that all ows live insertion of boards.

The CY74FCT16646T is ideally suited for driving

high-capacitance loads and low-impedance backplanes.

The CY74FCT162646T 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

CY74FCT162646T is ideal for driving transmission lines.

Logic Block Diagrams

FCT16646-1

1B1

1A1

TO 7 OTHER CHANNELS

1SAB

1CLKAB

1CLKBA

1DIR

1SBA

1OE

B REG

A REG

2B1

2A1

2SAB

2CLKAB

2CLKBA

2DIR

2SBA

2OE

B REG

FCT16646-2

TO 7 OTHER CHANNELS

A REG

CY74FCT16646T

CY74FCT162646T

GND

1DIR

SSOP/TSSOP

Top V i ew

1CLKAB

1SAB

1A1

1A2

1CLKBA

1SBA

1B1

1OE

GND

VCC

1A3VCC

GND

1A4

1A5

1A6

1A7

1A8

2A1

2A2

2A3

2A4

GND

2A5

2A6

VCC

2A7

2A8

2SAB

2CLKAB

GND

2DIR

1B2

1B3

1B4

1B5

1B6

1B7

1B8

2B1

2B2

2B3

GND

2B4

2B5

2B6

VCC

2B7

2B8

GND

2SBA

2CLKBA

2OE

FCT16646-3

Pin C onfi guration

Pin Description

Pin Names Description

AData Regi ster A Inputs

Data Regi ster B Outputs

BData Regi ster B Inputs

Data Regi ster A Outputs

CLKAB, CLKBA Clock Pulse In puts

SAB, SBA Output Data Source Select Input s

DIR Direction

OE Output Enable (Active LOW)

CY74FCT16646T

CY74FCT162646T

Function Table[1]

Inputs Data I/O[2] Function

OE DIR CLKAB CLKBA SAB SBA A B

XH or L H or L X

XInput Input Isolation

Store A and B Data

H or L X

HOutput Input Real Time B Data to A Bus

Stored B Data to A Bus

H or L X

XInput Output Real Time A Data to Bus

Stored A Data to B Bus

Notes:

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

2. The data output functions may be enabled or disabled by various signals at the OE or DIR inputs. Data input functions are always enabled, i.e., data at the

bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.

3. Cannot transfer data to A-bus and B-bus simultaneously.

BUS BBUS A

DIR

LOE

LCLKAB

XSAB

BUS BBUS A

DIR

CLKAB

SAB

SBA

BUS BBUS A

DIR

HOE

LSAB

LSBA

BUS ABUS A

DIR

SAB

SBA

Real-Time Transfer

BusB to BusA Real-Time Transfer

BusA to BusB

Storage from

A and/orB TransferStoredData

to A and/orB

CLKBA

XCLKAB

XCLKBA

SBA

CLKBA

XCLKAB

HorL

CLKBA

HorL

[3]

CY74FCT16646T

CY74FCT162646T

Maximum Ratings[4]

(Above which the useful life may be imp air ed. For user gui de-

li nes, not tes ted.)

Sto ra g e Temp e ra tu r e ...... ..... ....... ...Co m’l −55°C to +125°C

Ambient Temperature with

Power Applied.................................Com’l −55°C to +125°C

DC Input Voltage.................................................−0.5V to +7.0V

DC Output Volta ge..............................................−0.5V to +7.0V

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

Range Ambient

Temperature VCC

Industrial −40°C to +85°C 5V ± 10%

Electrical Characteristics Ov er the Oper ati ng Range

Parameter Description Test Conditions Min. Typ.[5] Max. Unit

VIH Input HIGH Voltage 2.0 V

VIL Input LO W Vol tage 0.8 V

VHInput Hysteresis[6] 100 mV

VIK Input Clamp Diode Vol tage VCC=Min., IIN=−18 mA −0.7 −1.2 V

IIH Input HIGH Current VCC=Max., VI=VCC ±1µA

IIL Input LO W Cur rent VCC=Max., VI=GND ±1µA

IOZH High Impedance Output Current

(Three-State Output pi ns) VCC=Max., VOUT=2.7V ±1µA

IOZL High Impedance Output Current

(Three-State Output pi ns) VCC=Max., VOUT=0.5V ±1µA

IOS Short Circuit Current[7] VCC=Max., VOUT=GND −80 −140 −200 mA

IOOutput Drive Current[7] VCC=Max., VOUT=2.5V −50 −180 mA

IOFF Power-O ff Disable VCC=0V, VOUT≤4.5V[9] ±1µA

Output D rive Characteristics for CY74FCT16646T

Parameter Description Test Conditions Min. Typ.[5] Max. Unit

VOH Output HIGH Voltage VCC=Min., IOH=−3 m A 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 Ou tp ut LOW Voltage VCC=Min., IOL=64 mA 0.2 0.55 V

Output D rive Characteristics for CY74FCT162646T

Parameter Description Test Conditions Min. Typ.[5] Max. Unit

IODL Output LOW Current[7] VCC=5V, VIN=VIH or VIL, VOUT=1.5V 60 115 150 mA

IODH Output HIGH Current[7] 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 Ou tp ut LOW Voltage VCC=Min., IOL=24 mA 0.3 0.55 V

Notes:

4. Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation

of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect reliability.

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

6. This parameter is guaranteed 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 abo ve normal and thereby cause inval id readings in other parametrics tests. In any sequence of parameter

tests, IOS tests should be performed last.

8. This parameter is measured at characterization but not tested.

9. Tested at +25°C.

CY74FCT16646T

CY74FCT162646T

Capacitance (TA = +25°C, f = 1.0 M Hz)

Symbol Description[8] Conditions Typ. Max. Unit

CIN Input Capacitanc e VIN = 0V 4.5 6.0 pF

COUT Output Capacitance VOUT =0V 5.5 8.0 pF

Power Supply Characteristic s

Parameter Description Test Conditions[10] Min. Typ.[5] Max. Unit

ICC Quiescent P ower Supply Current VCC=Max. VIN<0.2V

VIN>VCC−0.2V — 5 500 µA

∆ICC Quiescent Power Supp ly Cur rent

TTL Inputs HIGH VCC = Max.

VIN=3.4V[11] —0.5 1.5 mA

ICCD Dynamic Power Supply

Current[12] VCC=Max.

Outputs Open

DIR=OE=GND

One-Bit Toggli ng

50% Duty Cycle

VIN=VCC or

VIN=GND —75 120 µA/MHz

ICTotal Po wer Supply Current[13] VCC=Max.

Outputs Open

fo=10 M H z (CLKBA)

50% Duty Cycle

DIR=OE=GND

One-Bit Toggli ng

f1=5 MHz

50% Duty Cycle

VIN=VCC or

VIN=GND —0.8 1.7 mA

VIN=3.4V or

VIN=GND —1.3 3.2

VCC=Max.

Outputs Open

fo=10 MHz (CLKBA)

50% Duty Cycle

DIR=OE=GND

Sixt een-Bits Toggl ing

f1=2.5 MHz

50% Duty Cycle

VIN=VCC or

VIN=GND —3.8 6.5[14]

VIN=3.4V or

VIN=GND —8.3 20.0[14]

Notes:

10. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

11. Per TTL driven input (VIN=3.4V); all other inputs at VCC or G ND.

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

13. IC=I

QUIESCENT + IINPUTS + IDYNAMIC

IC=I

CC+∆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.

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

CY74FCT16646T

CY74FCT162646T

Swi tch i ng C h ara cter i sti cs Over the Operating Range[15]

Parameter Description

CY74FCT16646T

CY74FCT162646T CY74FCT16646AT

CY74FCT162646AT

UnitMin. Max. Min. Max. Fig. No.[16]

tPLH

tPHL Propagation Delay

Bus to Bus 1.5 9.0 1.5 6.3 ns 1, 2

tPZH

tPZL Output Enable Time

DIR or OE to Bus 1.5 14.0 1.5 9.8 ns 1, 7, 8

tPHZ

tPLZ Output Disable Time

DIR or OE to Bus 1.5 9.0 1.5 6.3 ns 1, 7, 8

tPLH

tPHL Propagati on Dela y

Clock to Bus 1.5 9.0 1.5 6.3 ns 1, 5

tPLH

tPHL Propagati on Dela y

SBA or SAB to Bus 1.5 11.0 1.5 7.7 ns 1,5

tSU Set-Up Time HIGH or

LO W Bus to Cl ock 2.0 —2.0 —ns 4

tHHold Time HIGH or

LO W Bus to Cl ock 1.5 —1.5 —ns 4

tWClock Pulse Widt h

HIGH or LO W 5.0 —5.0 —ns 6

tSK(O) Output Skew[17] —0.5 —0.5 ns —

Parameter Description

CY74FCT16646CT

CY74FCT162646CT CY74FCT16646ET

CY74FCT162646ET

UnitMin. Max. Min. Max. Fig. No. [16]

tPLH

tPHL Propagation Delay

Bus to Bus 1.5 5.4 1.5 3.8 ns 1, 2

tPZH

tPZL Output Enable Time

DIR or OE to Bus 1.5 7.8 1.5 4.8 ns 1, 7, 8

tPHZ

tPLZ Output Disable Time

DIR or OE to Bus 1.5 6.3 1.5 4.0 ns 1, 7, 8

tPLH

tPHL Propagati on Dela y

Clock to Bus 1.5 5.7 1.5 3.8 ns 1, 5

tPLH

tPHL Propagati on Dela y

SBA or SAB to Bus 1.5 6.2 1.5 4.2 ns 1,5

tSU Set-Up Time HIGH or

LO W Bus to Cl ock 2.0 —2.0 —ns 4

tHHold Time HIGH or

LO W Bus to Cl ock 1.5 —0.0 —ns 4

tWClock Pulse Widt h

HIGH or LO W 5.0 —3.0 —ns 6

tSK(O) Output Skew[17] —0.5 —0.5 ns —

Notes:

15. Minimum limits are guaranteed but not tested on Propagation Delays.

16. See “Parameter Measurement Information” in the General Information section.

17. Skew any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.

CY74FCT16646T

CY74FCT162646T

Document #: 38-00383-C

Ordering Information CY74FCT16646

Speed

(ns) Ordering Code Package

Name Package Type Operating

Range

3.8 CY74FCT16646ETPAC Z56 56-Lead (240-Mil ) TSSOP Industrial

CY74FCT16646ETPVC O56 56-Lead (300-Mi l) SSOP

5.4 CY74FCT16 646CTPA C Z56 56-Lead (240-Mil) TSSOP Industrial

CY74FCT16646CTPVC O56 56-Lead (300-Mi l) SSOP

6.3 CY74FCT16 646ATPAC Z56 56-Lead (240-Mil) TSSOP Industrial

CY74FCT16646ATPVC O56 56-Lead (30 0-Mil) SSOP

9.0 CY74FCT16 646TPA C Z56 56-Lead (240-Mil) TSSOP Industrial

CY74FCT16646TPVC O56 56-Lead (300-Mi l) SSOP

Ordering Information CY74FCT162646

Speed

(ns) Ordering Code Package

Name Package Type Operating

Range

3.8 CY74FCT162646ETPAC Z56 56-Lead (240-Mil) TSSOP Industrial

CY74FCT162646ETPVC O56 56-Lead (300-Mi l) SSOP

5.4 CY74FCT16 2646CTPA C Z56 56-Lead (240-Mil) TSSOP Industrial

CY74FCT162646CTPVC O56 56-Lead (300-Mi l) SSOP

6.3 CY74FCT16 2646ATPA C Z56 56-Lead (240-Mil) TSSOP Industrial

CY74FCT162646ATPVC O56 56-Lead (30 0-Mil) SSOP

9.0 CY74FCT16 2646TPA C Z56 56-Lead (240-Mil ) TSSOP Industrial

CY74FCT162646TPVC O56 56-Lead (300-Mi l) SSOP

CY74FCT16646T

CY74FCT162646T

of any circui try other than circuitry embodied in a Cypress Semiconduc tor produc t. Nor does it conv ey or imply any license under patent or other rights. Cypress Semi conductor does not author ize

its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress

Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.

Package Di ag ra ms

56-Lead Shrunk Small Outline Package O56

56-Lead Thin Shrunk Small Outline Package Z56