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Logic Block Diagram
A0 B0
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PI74FCT521T 8-BIT IDENTITY COMPARATOR
PI74FCT521T
Product Features:
* PI74FCT521T is pin compatible with bipolar FASTTM Series at a higher speed and lower power consumption * TTL input and output levels * Extremely low static power * Hysteresis on all inputs * Industrial operating temperature range: -40C to +85C * Packages available: - 20-pin 173 mil wide plastic TSSOP (L) - 20-pin 300 mil wide plastic DIP (P) - 20-pin 150 mil wide plastic QSOP (Q) - 20-pin 150 mil wide plastic TQSOP (R) - 20-pin 300 mil wide plastic SOIC (S)
Fast CMOS 8-Bit Identity Comparator
Product Description:
Pericom Semiconductor's PI74FCT series of logic circuits are produced in the Company's advanced 0.8 micron CMOS technology, achieving industry leading speed grades. The PI74FCT521T is an 8-bit identity comparator. When two words of up to eight bits are compared, a bit-for-bit match of the two words provides a LOW output. The comparison can be extended over multiple words by the expansion input. The expansion input IA=B also serves as an active LOW enable input.
A1 B1
A2 B2
A3 B3
OA=B
A4 B4
A5 B5
A6 B6
A7 B7
IA=B
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PI74FCT521T 8-BIT IDENTITY COMPARATOR
Product Pin Description
Pin Name IA=B OA=B A0-A7 B0-B7 GND VCC Description Expansion or Enable Input (Active LOW) Identity Output (Active LOW) Word A Inputs Word B Inputs Ground Power
Truth Table(1)
Inputs IA=B L L H H A, B A = B* AB A = B* AB Output OA=B L H H H
Product Pin Configuration
IA=B A0 B0 A1 B1 A2 B2 A3 B3 GND
1 20 2 19 3 20-PIN 18 L20 17 4 P20 16 5 Q20 15 6 R20 7 14 S20 8 13 9 12 10 11
NOTE: 1. H = High Voltage Level L = Low Voltage Level, *A0 = B0, A1 = B1, A2 = B2, etc.
Vcc OA=B B7 A7 B6 A6 B5 A5 B4 A4
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PI74FCT521T 8-BIT IDENTITY COMPARATOR
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature .................................................................... -65C to +150C Ambient Temperature with Power Applied .....................................-40C to +85C Supply Voltage to Ground Potential (Inputs & Vcc Only) .............. -0.5V to +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) ........... -0.5V to +7.0V DC Input Voltage ............................................................................ -0.5V to +7.0V DC Output Current ..................................................................................... 120 mA Power Dissipation ..........................................................................................0.5W Note: 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.
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 5V 5%)
Parameters Description VOH VOL VIH VIL IIH IIL VIK IOS IOFF VH Output HIGH Voltage Output LOW Current Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Clamp Diode Voltage Short Circuit Current Power Down Disable Input Hysteresis Test Conditions(1) VCC = Min., VIN = VIH or VIL VCC = Min., VIN = VIH or VIL Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VCC = Max. VCC = Min., IIN = -18 mA VCC = Max.(3), VOUT = GND VCC = GND, VOUT = 4.5V -60 -- VIN = VCC VIN = GND -0.7 -120 -- 200 100 IOH = -15.0 mA IOL = 48 mA 2.0 0.8 1 -1 -1.2 Min. 2.4 Typ(2) 3.0 0.3 0.50 Max. Units V V V V A A V mA A m V
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) CIN COUT Description Input Capacitance Output Capacitance Test Conditions VIN = 0V VOUT = 0V Typ 6 8 Max. 10 12 Units pF pF
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at Vcc = 5.0V, +25C ambient and maximum loading. 3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second. 4. This parameter is determined by device characterization but is not production tested.
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PI74FCT521T 8-BIT IDENTITY COMPARATOR
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., Outputs Open One Input Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle One Bit Toggling VIN = GND or VCC VIN = 3.4V(3) VIN = VCC VIN = GND Min. Typ(2) 0.1 0.5 0.15 Max. 500 2.0 0.25 Units A mA mA/ MHz
IC
Total Power Supply Current(6)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND
1.5 1.8
3.5(5) 4.5(5)
mA
Notes: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at Vcc = 5.0V, +25C ambient. 3. Per TTL driven input (VIN = 3.4V); all other inputs at Vcc or GND. 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 Icc formula. These limits are guaranteed but not tested. 6. IC =IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fCP/2 + fINI) ICC = Quiescent Current 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) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fI = Input Frequency NI = Number of Inputs at fI All currents are in milliamps and all frequencies are in megahertz.
Switching Characteristics over Operating Range
521T Com. 521AT Com. Max Min Max 521BT Com. Min Max 521CT Com. Min Max 521DT Com. Min Max Unit
Parameters tPLH tPHL tPLH tPHL
Description Propagation Delay AN or BN to OA=B Propagation Delay IA=B to OA=B
Conditions(1) CL = 50 pF RL = 500
Min
1.5 1.5
10.0 9.0
1.5 1.5
7.2 6.0
1.5 1.5
5.5 4.6
1.5 1.5
4.5 4.1
1.5 1.5
4.2 3.8
ns ns
Notes: 1. See Test Circuit and Waveforms 2. Minimum limits are guaranteed but not tested on Propagation Delays.
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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