Datasheet IDT74FCT521TSOB, IDT74FCT521CTSOB, IDT74FCT521CTSO, IDT74FCT521CTQB, IDT74FCT521CTQ Datasheet (Integrated Device Technology)

Integrated Device Technology, Inc.

FAST CMOS 8-BIT
IDENTITY COMPARATOR

IDT54/74FCT521T
IDT54/74FCT521AT
IDT54/74FCT521BT
IDT54/74FCT521CT

FEATURES:

• Std., A, B and C speed grades

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

• CMOS power levels

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

OL = 0.3V (typ.)

• High drive outputs (-15mA IOH, 48mA IOL)

• 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, SSOP, QSOP, CERPACK and

LCC packages

A0
B0

A1
B1

A2
B2

A3
B3

A4
B4

OA=B

DESCRIPTION:

The IDT54/74FCT521T/AT/BT/CT are 8-bit identity com­parators built using an advanced dual metal CMOS technol­ogy. These devices compare two words of up to eight bits each
and provide a LOW output when the two words match bit for
bit. The expansion input

I

A = B also serves as an active LOW

enable input.

PIN CONFIGURATIONSFUNCTIONAL BLOCK DIAGRAM

IA=B

A0
B0

A1

B1
A2

B2

A3

B3

GND

DIP/SOIC/SSOP/QSOP/CERPACK

2
3

P20-1

4

D20-1

SO20-2

5

SO20-7

6

SO20-8

7
8

E20-1
9
10 11

TOP VIEW

20
19
18
17
16
15
14

&

13
12

VCC1
OA=B
B

7

A7
B6
A6
B5
A5
B4
A4

2572 drw 02

A5
B5

A6
B6

A7
B7

IA=B

2572 drw 01

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

INDEX

A1
B1
A2
B2
A3

A0

B0

IA=B

3 2 20 19

4
5

6
7
8

1

L20-2

9 10111213

4

B3

A

GND

LCC

TOP VIEW

VCC

B4

OA=B

18
17

16
15
14

A5

B7
A7

B6
A6

B5

2572 drw 03

MILITARY AND COMMERCIAL TEMPERATURE RANGES APRIL 1995

1995 Integrated Device Technology, Inc. 6.16 DSC-4210/4

1

IDT54/74FCT521T/AT/BT/CT
FAST CMOS 8-BIT IDENTITY COMPARATOR

MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION

Pin Names Description

A0 - A

7

B0 - B

7

IA =

B

OA =

B

FUNCTION TABLE

Word A Inputs
Word B Inputs

Expansion or Enable Input (Active LOW)
Identity Output (Active LOW)

(1)

2572 tbl 01

Inputs Output

I

A=B A, B

I

L

L
H
H

NOTE: 2572 tbl 02

1. H = HIGH Voltage Level
L = LOW Voltage Level

A0 = B0, A1 = B1, A2 = B2, etc.

*

A = B*

A ≠ B

A = B*

A ≠ B

O

A=B

O

L
H
H
H

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

2572 lnk 04

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Commercial Military Unit

(2)

VTERM

Terminal Voltage

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

(3)

VTERM

TA Operating

Terminal Voltage
with Respect to
GND

–0.5 to

CC +0.5

V

–0.5 to

VCC +0.5

0 to +70 –55 to +125 °C

V

Temperature

TBIAS Temperature

–55 to +125 –65 to +135 °C
Under Bias

TSTG Storage

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

PT Power Dissipation 0.5 0.5 W
IOUT DC Output

–60 to +120 –60 to +120 mA
Current

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

CC by +0.5V unless otherwise noted.

2. Input and V

3. Outputs and I/O terminals only.

CC terminals only.

2572 lnk 03

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

V

IL

I

I H

I

I L

I

I

V

IK

I

OS

V

OH

V

OL

V

H

I

CC

NOTES: 2572 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. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.

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

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

(4)

(4)

(4)

VCC = Max. VI = 2.7V — —
VCC = Max. VI = 0.5V — —
VCC = Max., VI = V

CC

(Max.) — —

Input HIGH Current
Input LOW Current
Input HIGH Current
Clamp Diode Voltage VCC = Min., IN = –18mA — –0.7 –1.2 V
Short Circuit Current VCC = Max.

(3)

, VO = GND –60 –120 –225 mA

Output HIGH Voltage VCC = Min.

V

IN

= V

IH

or V

IL

Output LOW Voltage VCC = Min.

V

IN

= V

IH

or V

IL

Input Hysteresis

—

Quiescent Power Supply Current VCC = Max.

V

IN

= GND or V

CC = 5.0V, +25°C ambient.

A = -55°C.

CC

(1)

IOH = –6mA MIL.
I

OH

= –8mA COM'L.
IOH = –12mA MIL.
I

OH

= –15mA COM'L.
IOL = 32mA MIL.
I

OL

= 48mA COM'L.

Min. Typ.

2.4 3.3 — V

2.0 3.0 — V

— 0.3 0.5 V

— 200 — mV
— 0.01 1 mA

(2)

Max. Unit

±
±
±

1

µ

A

1

µ

A

1

µ

A

6.16 2

IDT54/74FCT521T/AT/BT/CT
FAST CMOS 8-BIT IDENTITY COMPARATOR MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

Symbol Parameter Test Conditions

∆ICC

Quiescent Power Supply
Current TTL

CC = Max.

V

IN = 3.4V

V

(3)

(1)

Min. Typ.

— 0.5 2.0 mA

Inputs HIGH

ICCD Dynamic Power Supply Current

(4)

VCC = Max.
Outputs Open

IN = VCC

V

IN = GND

V

— 0.15 0.25 mA/

One Input Toggling
50% Duty Cycle

IC Total Power Supply Current

(5)

VCC = Max.
Outputs Open
fi = 10MHz
One Bit Toggling

VIN = VCC

IN = GND

V

IN = 3.4V

V

IN = GND

V

— 1.5 3.5 mA

— 1.8 4.5

50% Duty Cycle

NOTES:

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

C = IQUIESCENT + IINPUTS + IDYNAMIC

6. I
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fiNi)
I

CC = Quiescent Current

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

∆I

H = Duty Cycle for TTL Inputs High

D

T = Number of TTL Inputs at DH

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

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

f

i = Input Frequency

f

i = Number of Inputs at fi

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

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

MHz

2572 tbl 06

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

IDT54/74FCT521T IDT54/74FCT521AT IDT54/74FCT521BT IDT54/74FCT521CT

Com'l. Mil. Com'l. Mil. Com'l. Mil. Com'l. Mil.

(1)

(2)

Symbol Parameter Condition

t

PLH

t

PHL

Propagation
Delay

CL = 50pF

RL = 500

Min.

Max. Min.

1.5 11.0 1.5 15.0 1.5 7.2 1.5 9.5 1.5 5.5 1.5 7.3 1.5 4.5 1.5 5.1 ns

Ω

An or Bn to

O

A

=

B

t

PLH

Propagation
Delay

t

PHL

I

A

= B to

O

A

=

B

NOTES: 2572 tbl 07

1. See test circuit and waveforms.

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

1.5 10.0 1.5 9.0 1.5 6.0 1.5 7.8 1.5 4.6 1.5 6.0 1.5 4.1 1.5 4.5 ns

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Unit

6.16 3

IDT54/74FCT521T/AT/BT/CT
FAST CMOS 8-BIT IDENTITY COMPARATOR

TEST CIRCUITS AND WAVEFORMS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

TEST CIRCUITS FOR ALL OUTPUTS

SWITCH POSITION

Test

V

CC

7.0V

Open Drain
Disable Low

Pulse

Generator

500Ω

V

V

IN

D.U.T.

T

R

OUT

50pF

C L

500Ω

2572 drw 04

DEFINITIONS:

L= Load capacitance: includes jig and probe capacitance.

C
R

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

Enable Low

All Other Tests

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.

tSU

tSU

tH

tREM

tH

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V

0V

3V

1.5V
0V

2572 drw 05

LOW-HIGH-LOW

PULSE

HIGH-LOW-HIGH

PULSE

Switch

Closed

Open

2572 lnk 08

1.5V

tW

1.5V

2572 drw 06

SAME PHASE

INPUT TRANSITION

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

tPLH

tPHL

tPLH tPHL

3V

1.5V
0V

V

OH

1.5V

VOL

3V

1.5V
0V

2572 drw 07

ENABLE AND DISABLE TIMESPROPAGATION DELAY

ENABLE DISABLE

3V

CONTROL

INPUT

PLZtPZL

t

OUTPUT

NORMALLY

LOW

SWITCH
CLOSED

3.5V

1.5V

tPZH tPHZ

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

SWITCH
OPEN

1.5V
0V

F ≤ 2.5ns; tR ≤ 2.5ns

0.3V

0.3V

1.5V
0V

3.5V

VOL

VOH

0V

2572 drw 08

6.16 4

IDT54/74FCT521T/AT/BT/CT
FAST CMOS 8-BIT IDENTITY COMPARATOR MILITARY AND COMMERCIAL TEMPERATURE RANGES

ORDERING INFORMATION

IDT XX FCT

Temp. Range

X

Family

XXXX

Device TypeXPackage

X

Process

Blank
B

P
D
E
L
SO
P
Q

521T

Commercial
MIL-STD-883, Class B

Plastic DIP
CERDIP
CERPACK
Leadless Chip Carrier
Small Outline IC
Shrink Small Outline Package
Quarter-size Small Outline Package

8-Bit Comparator
521AT
521BT
521CT

Blank High Drive

54
74

–55°C to +125°C

0°C to +70°C

2572 drw 09

6.16 5