Datasheet IDT74FCT621ATSOB, IDT74FCT621TSOB, IDT74FCT621ATSO, IDT74FCT621ATPB, IDT74FCT621ATP Datasheet (Integrated Device Technology)

IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) MILITARY AND COMMERCIAL TEMPERATURE RANGES

FAST CMOS

IDT54/74FCT621T/AT

OCTAL BUS TRANSCEIVER
(OPEN DRAIN)

Integrated Device Technology, Inc.

FEATURES:

• Std. and A speed grades

• Low input and output leakage ≤1µA (max.)

• CMOS power levels

• True TTL input and output compatibility
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)

• Power off disable outputs permit “live insertion”

• Meets or exceeds JEDEC standard 18 specifications

• Product available in Radiation Tolerant and Radiation

Enhanced versions

• Military product compliant to MIL-STD-883, Class B

and DESC listed (dual marked)

• Available in DIP, SOIC, CERPACK and LCC packages

FUNCTIONAL BLOCK DIAGRAM

GBA

GAB

1

A

(1)

B

1

DESCRIPTION:

The IDT54/74FCT621T/AT is an octal transceiver with
non-inverting Open-Drain bus compatible outputs in both
send and receive directions. The B bus outputs are capable
of sinking 64mA providing very good capacitive drive
characteristics. These octal bus transceivers are designed for
asynchronous two-way communication between data buses.
The control function implementation allows for maximum
flexibility in timing.

PIN CONFIGURATIONS

GAB

A

A
A
A
A
A
A
A

GND

1
2

1

3

2
3
4
5
6
7
8

4
5
6
7
8
9
10

P20-1,
D20-1,

SO20-2

&

E20-1

DIP/SOIC/CERPACK

TOP VIEW

20
19
18
17
16
15
14
13
12
11

Vcc
GBA
B

1

B

2

B

3

B

4

B

5

B

6

B

7

B

8

2538 drw 02

2

32

4
5
6
7
8

10 11 12 13

9

8

A

A1A

GAB

1

L20-2

20 19

8

Vcc

GBA

18
17
16
15
14

B6B7B

B

1

B

2

B

3

B

4

B

5

2538 drw 03

A2–A

8

7 Other Transceivers

B

2–B8

2538 drw 01

INDEX

A

3

A

4

A

5

A

6

A

7

GND

LCC

TOP VIEW

The IDT logo is a registered trademark of Integreted Device Technology, Inc.

MILITARY AND COMMERCIAL TEMPERATURE RANGES APRIL 1994

1995 Integrated Device Technology, Inc. 6.18 DSC-4222/4

6.18 1
1

IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION

Pin Names Description

G

BA, GAB Enable Inputs

1 – A8 A Inputs or Open-drain Outputs

A

1 – B8 B Inputs or Open-drain Outputs

B

2538 tbl 01

ABSOLUTE MAXIMUM RATINGS

Symbol Rating Commercial Military Unit

(2)

VTERM

VTERM

TA Operating

TBIAS Temperature

TSTG Storage

PT Power Dissipation 0.5 0.5 W
IOUT DC Output

NOTES:

1. Stresses greater than those listed under ABSOLUTE 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. No terminal voltage may exceed
V

2. Input and V

3. Outputs and I/O terminals only.

Terminal Voltage

–0.5 to +7.0 –0.5 to +7.0 V
with Respect to
GND

(3)

Terminal Voltage
with Respect to
GND

–0.5 to

V

0 to +70 –55 to +125 °C

Temperature

–55 to +125 –65 to +135 °C
Under Bias

–55 to +125 –65 to +150 °C
Temperature

–60 to +120 –60 to +120 mA
Current

CC by +0.5V unless otherwise noted.

CC terminals only.

CC +0.5

(1)

–0.5 to

VCC +0.5

V

2538 lnk 03

FUNCTION TABLE

(1)

Enable Inputs

GGBA GAB Function

L L B data to A bus
H H A data to B bus
H L OFF
L H B data to A bus

A data to B bus

NOTE: 2538 tbl 02

1. H = HIGH Voltage Level.
L = LOW Voltage Level.
OFF = HIGH if pull-up resistor is connected to Open-Drain output.

CAPACITANCE (TA = +25°C, f = 1.0MHz)

Symbol Parameter

CIN Input

Capacitance

COUT Output

Capacitance

NOTE:

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

(1)

Conditions Typ. Max. Unit

VIN = 0V 6 10 pF

VOUT = 0V 8 12 pF

2538 lnk 04

6.18 2

IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) MILITARY AND COMMERCIAL TEMPERATURE RANGES

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following conditions Apply Unless Otherwise Specified:
Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%

Symbol Parameter Test Conditions

V

IH Input HIGH Level Guaranteed Logic HIGH Level 2.0 — — V
IL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V

V

(5)

(5)

(5)

VCC = Max., VI = 2.7V — — ±1 µA
VCC = Max., VI = 0.5V — — ±1 µA
VCC = Max., VI = VCC (Max.) — — ±1 µA

IN = VIH or VIL

V

IH Input HIGH Current

I

IL Input LOW Current

I

I Input HIGH Current

I

IK Clamp Diode Voltage VCC = Min., IN= –18mA — –0.7 –1.2 V

V

OH Output HIGH Current VCC = Max. VOH = Vcc (Max.) — — 20 µA

I

VOL Output LOW Voltage VCC = Min. IOL = 48mA MIL.

(B Bus) V

OL Output LOW Voltage VCC = Min. IOL = 32mA MIL.

V

(A Bus) V

OFF Input/Output Power Off VCC = 0V, VIN or VO ≤ 4.5V — — ±1 µA

I

Leakage

(5)

IN = VIH or VIL IOL = 64mA COM’L.

IN = VIH or VIL IOL = 48mA COM’L.

(1)

(4)

(4)

Min. Typ.

— 0.3 0.55 V

— 0.3 0.5 V

VH Input Hysteresis — — 200 — m V

CC Quiescent Power Supply V CC = max., VIN = GND or Vcc — 0.01 1 mA

I

Current

NOTES: 2538 tbl 05

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

2. Typical values are at V

3. These are maximum I
384mA for military. Derate I

4. The test limit for this parameter is ±5µA at T

5. This parameter is guaranteed but not tested.

CC = 5.0V, +25°C ambient.

OL values per output, for 8 outputs turned on simultaneously. Total maximum IOL (all outputs) is 512mA for commercial and

OL for number of outputs exceeding 8 turned on simultaneously.

A = –55°C.

(2)

Max. Unit

6.18 3

IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

CC

(1)

Min. Typ.

IN = GND

Symbol Parameter Test Conditions

CC Quiescent Power Supply Current VCC = Max. — 0.5 2.0 mA

∆I

TTL Inputs HIGH V

ICCD Dynamic Power Supply Current

IN = 3.4V

(4)

Vcc = Max. VIN = VCC — 0.15 0.25 mA/MHz

(3)

Outputs Open V

G

BA = GAB = GND or V
One Input Toggling
50% Duty Cycle

I

C Total Power Supply Current

(6,7)

Vcc = Max. VIN = VCC — 1.5 3.5 mA
Outputs Open V

G

BA = GAB = GND or V

IN = GND

CC

One Bit Toggling VIN = 3.4V — 1.8 4.5
at f

i =10MHz VIN = GND

50% Duty Cycle
Vcc = Max. V

IN = VCC — 3.0 6.0

Outputs Open VIN = GND

G

BA = GAB = GND or V

CC

Eight Bits Toggling VIN = 3.4V — 5.0 14.0
at fi = 2.5MHz VIN = GND
50% Duty Cycle

NOTES: 2538 tbl 06

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

2. Typical values are at V

3. Per TTL driven input (V

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

5. Values for these conditions are examples of the I

6. I

C = IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fiNi)
ICC = Quiescent Current

CC = Power Supply Current for a TTL High Input (VIN = 3.4V)

∆I
D

H = Duty Cycle for TTL Inputs High
T = Number of TTL Inputs at DH

N
ICCD = Dynamic Current Caused by an Output Transition Pair (HLH or LHL)

CP = Clock Frequency for Register Devices (Zero for Non-Register Devices)

f

i = Input Frequency

f
N

i = Number of Inputs at fi

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

7. This test is performed with outputs tied to GND through a pull-down resistor.

CC = 5.0V, +25°C ambient.

IN = 3.4V); all other inputs at VCC or GND.

CC formula. These limits are guaranteed but not tested.

(2)

Max. Unit

(5)

(5)

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

IDT54/74FCT621T IDT54/74FCT621AT

Com’l. Mil. Com’l. Mil.

Symbol Parameter Condition

t

PLH Propagation Delay A to B CL = 50pF 5.5 13.0 5.5 13.5 5.5 12.0 5.5 12.5 ns
PHL RL = 500Ω 1.5 8.5 1.5 9.5 1.5 6.8 1.5 7.6

t

PLH Propagation Delay B to A 5.5 12.5 5.5 13.0 5.5 12.0 5.5 12.5 ns

t

PHL 1.5 8.0 1.5 9.0 1.5 6.4 1.5 7.2

t

PLH Propagation Delay

t

PHL 1.5 8.5 1.5 9.5 1.5 6.8 1.5 7.6

t

PLH Propagation Delay GAB to B 5.5 14.0 5.5 14.5 5.5 13.0 5.5 13.5 ns

t

PHL 1.5 8.0 1.5 9.0 1.5 6.4 1.5 7.2

t

NOTES:

1. See test circuit and waveforms.

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

G

BA to A 5.5 14.0 5.5 14.5 5.5 13.0 5.5 13.5 ns

(1)

(2)

Min.

6.18 4

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Unit

2538 tbl 07

IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) MILITARY AND COMMERCIAL TEMPERATURE RANGES

TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS

V

CC

V

OUT

50pF

C

L

Pulse

Generator

V

IN

D.U.T.

T

R

500

500

7.0V

Ω

Ω

2538 drw 03

SWITCH POSITION

Test Switch

Open Drain
Disable Low

Enable Low

All Other Tests

DEFINITIONS:

L= Load capacitance: includes jig and probe capacitance.

C

T = Termination resistance: should be equal to ZOUT of the Pulse

R

Generator.

SET-UP, HOLD AND RELEASE TIMES PULSE WIDTH

DATA

INPUT

TIMING

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLEAR

CLOCK ENABLE

ETC.

t

t

REM

H

t

H

t

SU

t

SU

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V

0V

3V

1.5V
0V

2538 drw 04

LOW-HIGH-LOW

PULSE

HIGH-LOW-HIGH

PULSE

Closed

Open

2538 lnk 08

1.5V

t

W

1.5V

2538 drw 05

SAME PHASE

INPUT TRANSITION

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

t

PLH

t

PLH

t

t

PHL

PHL

3V

1.5V
0V

V

OH

1.5V

V

OL

3V

1.5V
0V

2538 drw 06

ENABLE AND DISABLE TIMESPROPAGATION DELAY

ENABLE DISABLE

3V

CONTROL

INPUT

t

t

PLZ

PHZ

F ≤ 2.5ns; tR ≤ 2.5ns

t

PZL

OUTPUT

NORMALLY

OUTPUT

NORMALLY

HIGH

NOTES:

1. Diagram shown for input Control Enable-LOW and input Control Disable­HIGH

2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; t

LOW

SWITCH
CLOSED

t

PZH

SWITCH
OPEN

3.5V

1.5V

1.5V
0V

0.3V

0.3V

1.5V
0V

3.5V

V

OL

V

OH

0V

2538 drw 07

6.18 5

IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) MILITARY AND COMMERCIAL TEMPERATURE RANGES

ORDERING INFORMATION

IDT

XX

Temperature Range

FCT

X

Family

X

DeviceType

X

PackageXProcess

Blank
B

P
D
SO
L
E

621T
621AT

54
74

Commercial
MIL-STD-883, Class B

Plastic DIP
CERDIP
Small Outline IC
Leadless Chip Carrier
CERPACK

Octal Bus Transceiver

High DriveBlank

–55°C to +125°C
0°C to +70°C

2538 drw 08

6.18 6