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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT138/238T 1-OF-8 DECODER
PI74FCT138T PI74FCT238T
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
Fast CMOS 1-of-8 Decoder
Product Features:
* PI74FCT138/238T 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: - 16-pin 150 mil wide plastic QSOP (Q) - 16-pin 300 mil wide plastic SOIC (S) - 16-pin 150 mil wide plastic SOIC (W)
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. These high-speed decoders accept three binary weighted inputs (A0, A1, A2) and gives eight mutually exclusive active LOW outputs (O0-O7: PI74FCT138T) or active HIGH outputs (O0-O7: PI74FCT238T) when enabled. These devices contain three enable inputs, two active LOW (E1, E2) and one active HIGH (E3). On the PI74FCT138T all outputs will be HIGH and on the PI74FCT238T all outputs will be LOW, except when E1 and E2 are LOW and E3 is HIGH.
Logic Block Diagram
A2 A1 A0 E1 E2 E3
O7
O6
O5
O4
O3
O2
O1
O0
PI74FCT138T function shown.
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PI74FCT138/238T 1-OF-8 DECODER
PI74FCT138T Product Pin Configuration
A0 A1 A2 E1 E2 E3 O7 GND
1 2 3 4 5 6 7 8 16 15 14
PI74FCT138T Product Pin Description
Pin Name A0-A2 E1, E2 E3 O0-O7 Description Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active LOW)
16-PIN Q16 13 S16 12 W16 11
10 9
VCC O0 O1 O2 O3 O4 O5 O6
PI74FCT138T Truth Table (1)
E1 H X X L L L L L L L L E2 X H X L L L L L L L L Inputs E3 A0 X X X X L X H L H H H L H H H L H H H L H H A1 X X X L L H H L L H H A2 X X X L L L L H H H H O0 H H H L H H H H H H H O1 H H H H L H H H H H H O2 H H H H H L H H H H H Outputs O3 O4 H H H H H H H H H H H H L H H L H H H H H H O5 H H H H H H H H L H H O6 H H H H H H H H H L H O7 H H H H H H H H H H L Function Disable Disable Disable A2-0 = 0 A2-0 = 1 A2-0 = 2 A2-0 = 3 A2-0 = 4 A2-0 = 5 A2-0 = 6 A2-0 = 7
Note: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
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PI74FCT138/238T 1-OF-8 DECODER
PI74FCT238T Product Pin Configuration
A0 A1 A2 E1 E2 E3 O7 GND
1 2 3 4 5 6 7 8 16 15 14
PI74FCT238T Product Pin Description
Pin Name A0-A2 E1, E2 E3 O0-O7 Description Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active HIGH)
16-PIN 13 Q16 12 S16 W16 11
10 9
VCC O0 O1 O2 O3 O4 O5 O6
PI74FCT238T Truth Table (1)
E1 H X X L L L L L L L L E2 X H X L L L L L L L L Inputs E3 A0 X X X X L X H L H H H L H H H L H H H L H H A1 X X X L L H H L L H H A2 X X X L L L L H H H H O0 L L L H L L L L L L L O1 L L L L H L L L L L L O2 L L L L L H L L L L L Outputs O3 O4 L L L L L L L L L L L L H L L H L L L L L L O5 L L L L L L L L H L L O6 L L L L L L L L L H L O7 L L L L L L L L L L H Function Disable Disable Disable A2-0 = 0 A2-0 = 1 A2-0 = 2 A2-0 = 3 A2-0 = 4 A2-0 = 5 A2-0 = 6 A2-0 = 7
Note: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
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PI74FCT138/238T 1-OF-8 DECODER
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 = 5.0V 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. , VOUT = GND VCC = GND, VOUT = 4.5V
(3)
Min. IOH = -15.0 mA IOL = 48 mA 2.0 2.4
Typ(2) 3.0 0.3
Max.
Units V
0.50
V V
0.8 VIN = VCC VIN = GND -0.7 -60 -- -120 -- 200 1 -1 -1.2 -225 100
V A A V mA A mV
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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PI74FCT138/238T 1-OF-8 DECODER
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) Total Power Supply Current(6) VCC = Max. VCC = Max. VCC = Max., Outputs Open One Input Toggling 50% Duty Cycle VCC = Max., Outputs Open fCP = 10 MHZ, 50% Duty Cycle Toggle E1, E2, or E3 One Bit toggling Test Conditions(1) VIN = GND or VCC VIN = 3.4V(3) VIN = VCC VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND Min. Typ(2) 0.1 0.5 0.15 Max. 500 2.0 0.3 Units A mA mA/ MHz mA
IC
1.5 1.8
4.0(5) 5.0(5)
Notes: 1. Fo Max. or Min. conditions, 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) fo = Output Frequency No = Number of Outputs at fo All currents are in milliamps and all frequencies are in megahertz.
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PI74FCT138/238T 1-OF-8 DECODER
PI74FCT138T Switching Characteristics over Operating Range
138T Com. Min Max 1.5 1.5 1.5 9.0 9.0 9.0 138AT Com. Min Max 1.5 1.5 1.5 5.8 5.9 5.9 138CT Com. Min Max 1.5 1.5 1.5 5.1 5.2 5.2
Parameters tPLH tPHL tPLH tPHL tPLH tPHL
Description Propagation Delay An to On Propagation Delay E1 or E2 to On Propagation Delay E3 to On
Conditions(1)
CL = 50 pF RL = 500
Notes: 1. See test circuit and wave forms. 2. Minimum limits are guaranteed but not tested on Propagation Delays.
PI74FCT238T Switching Characteristics over Operating Range
238T Com. Min Max 1.5 1.5 1.5 9.0 8.0 8.0 238AT Com. Min Max 1.5 1.5 1.5 5.8 5.9 5.9 238CT Com. Min Max 1.5 1.5 1.5 5.0 5.0 5.0
Parameters tPLH tPHL tPLH tPHL tPLH tPHL
Description Propagation Delay An to On Propagation Delay E1 or E2 to On Propagation Delay E3 to On
Conditions(1) CL = 50 pF RL = 500
Unit ns ns ns
Notes: 1. See test circuit and wave forms. 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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