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1CY 54/7 4FCT138 T
fax id: 7013
CY54/74FCT138T
1-of-8 Decoder
Features
* Function, pinout, and drive compatible with FCT and F logic * FCT-C speed at 5.0 ns max. (Com'l), FCT-A speed at 5.8 ns max. (Com'l) * Reduced VOH (typically = 3.3V) versions of equivalent FCT functions * Edge-rate control circuitry for significantly improved noise characteristics * Power-off disable feature * ESD > 2000V * Matched rise and fall times * Fully compatible with TTL input and output logic levels * Extended commercial range of -40C to +85C * Sink current 64 mA (Com'l), 32 mA (Mil) 32 mA (Com'l), 12 mA (Mil) * Dual 1-of-8 decoder with enables Source current
Functional Description
The FCT138T is a 1-of-8 decoder. The FCT138T accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active LOW outputs (O0-O7). The FCT138T features three enable inputs, two active LOW (E1, E2) and one active HIGH (E3). All inputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four FCT138T devices and one inverter. The outputs are designed with a power-off disable feature to allow for live insertion of boards.
Logic Block Diagram
E1 E2 E3 A2 A1 A0
Pin Configurations
LCC Top View
E2 NC E1 A2 E3 A0 3 2 1 20 19 14 15 16 17 18 O4 O3 NC O2 O1 A1 A0 NC VCC O0 A1 A2 E1 E2 E3 O7 GND
DIP/SOIC/QSOP Top View
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC O0 O1 O2 O3 O4 O5 O6
8 O7 GND NC O6 O5 9 10 11 12 13
7654
FCT138T-2 O7 O6 O5 O4 O3 O2 O1 O0 FCT138T-1
FCT138T-3
Pin Description
Name A E1-E2 E3 O Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs Description
Cypress Semiconductor Corporation
*
3901 North First Street
*
San Jose
* CA 95134 * 408-943-2600 May 1994 - Revised March 17, 1997
CY54/74FCT138T
]
Function Table[1]
Inputs E1 H X X L L L L L L L L E2 X H X L L L L L L L L E3 X X L H H H H H H H H A0 X X X L H L H L H L 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 H H H H H H L H H H H O4 H H H H H H H L 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
Maximum Ratings[2, 3]
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................. -65C to +150C Ambient Temperature with Power Applied............................................. -65C to +135C Supply Voltage to Ground Potential ............... -0.5V to +7.0V DC Input Voltage............................................ -0.5V to +7.0V DC Output Voltage ......................................... -0.5V to +7.0V DC Output Current (Maximum Sink Current/Pin)....... 120 mA
Power Dissipation.......................................................... 0.5W Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015)
Operating Range
Range Commercial Military[4] Range All All Ambient Temperature -40C to +85C -55C to +125C VCC 5V 5% 5V 10%
Electrical Characteristics Over the Operating Range
Parameter VOH VOH VOH VOL VIH VIL VH VIK II IIH IIL IOS IOFF Description Output HIGH Voltage Output HIGH Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Hysteresis[6] Input Clamp Diode Voltage Input HIGH Current Input HIGH Current Input LOW Current Output Short Circuit Current[7] Power-Off Disable All inputs VCC=Min., IIN=-18 mA VCC=Max., VIN=VCC VCC=Max., VIN=2.7V VCC=Max., VIN=0.5V VCC=Max., VOUT=0.0V VCC=0V, VOUT=4.5V -60 -120 0.2 -0.7 -1.2 5 1 1 -225 1 Test Conditions VCC=Min., IOH=-32 mA VCC=Min., IOH=-15 mA VCC=Min., IOH=-12 mA VCC=Min., IOL=64 mA VCC=Min., IOL=32 mA Com'l Com'l Mil Com'l Mil 2.0 0.8 Min. 2.0 2.4 2.4 3.3 3.3 0.3 0.3 0.55 0.55 Typ.[5] Max. Unit V V V V V V V V V A A A mA A
Notes: 1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don't Care. 2. Unless otherwise noted, these limits are over the operating free-air temperature range. 3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V CC or ground. 4. TA is the "instant on" case temperature. 5. Typical values are at VCC=5.0V, TA=+25C 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 above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter tests, IOS tests should be performed last.
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CY54/74FCT138T
Capacitance[6]
Parameter CIN COUT Input Capacitance Output Capacitance Description Typ.[5] 5 9 Max. 10 12 Unit pF pF
Power Supply Characteristics
Parameter ICC ICC ICCD Description Quiescent Power Supply Current Quiescent Power Supply Current (TTL inputs) Dynamic Power Supply Current[9] Total Power Supply Current[10] Test Conditions VCC=Max., VIN<0.2V, VIN > VCC-0.2V VCC=Max., VIN=3.4V,[8] f1=0, Outputs Open VCC=Max., One Input Toggling, 50% Duty Cycle, Outputs Open, VIN < 0.2V or VIN > VCC-0.2V VCC=Max., f1=10 MHz, 50% Duty Cycle, Outputs Open, Toggle E1, E2, or E3, One Output Toggling, VIN < 0.2V or VIN > VCC-0.2V VCC=Max., f1=10 MHz, 50% Duty Cycle, Outputs Open, Toggle E1, E2, or E3, One Output Toggling, VIN=3.4V or VIN=GND
Notes: 8. Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND. 9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations. = IQUIESCENT + IINPUTS + IDYNAMIC 10. IC IC = ICC+I CCDHNT+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 = Number of TTL inputs at DH NT ICCD = Dynamic Current caused by an input transition pair (HLH or LHL) = Clock frequency for registered devices, otherwise zero f0 f1 = Input signal frequency = Number of inputs changing at f1 N1 All currents are in milliamps and all frequencies are in megahertz.
Typ.[5] 0.1 0.5 0.06
Max. 0.2 2.0 0.12
Unit mA mA mA/MHz
IC
0.7
1.4
mA
1.0
2.4
mA
3
CY54/74FCT138T
Switching Characteristics Over the Operating Range
FCT138T Military Parameter tPLH tPHL tPLH tPHL tPLH tPHL Description Propagation Delay A to O Propagation Delay E1 or E2 to O Propagation Delay E3 to O Min.
[11]
FCT138AT Military Min.
[11]
Commercial Min.
[11]
Commercial Min.[11] 1.5 1.5 1.5 Max. 5.8 5.9 5.9 Unit ns ns ns
Max. 12.0 12.5 12.5
Max. 9.0 9.0 9.0
Max. 7.8 8.0 8.0
Fig. No.[12] 1, 2 1, 5 1, 5
1.5 1.5 1.5
1.5 1.5 1.5
1.5 1.5 1.5
FCT138CT Military Parameter tPLH tPHL tPLH tPHL tPLH tPHL Description Propagation Delay A to O Propagation Delay E1 or E2 to O Propagation Delay E3 to O Min.[11] 1.5 1.5 1.5 Max. 6.0 6.1 6.1 Commercial Min.[11] 1.5 1.5 1.5 Max. 5.0 5.0 5.0 Unit ns ns ns Fig. No.[12] 1, 2 1, 5 1, 5
Ordering Information
Speed (ns) 5.0 5.8 Ordering Code CY74FCT138CTQC CY74FCT138CTSOC CY74FCT138ATPC CY74FCT138ATQC CY74FCT138ATSOC 6.0 9.0 CY54FCT138CTDMB CY54FCT138CTLMB CY74FCT138TSOC Package Name Q1 S1 P1 Q1 S1 D2 L61 S1 Package Type 16-Lead (150-Mil) QSOP 16-Lead (300-Mil) Molded SOIC 16-Lead (300-Mil) Molded DIP 16-Lead (150-Mil) QSOP 16-Lead (300-Mil) Molded SOIC 16-Lead (300-Mil) CerDIP 20-Pin Square Leadless Chip Carrier 16-Lead (300-Mil) Molded SOIC Commercial Military Commercial Operating Range Commercial
Notes: 11. Minimum limits are guaranteed but not tested on Propagation Delays. 12. See "Parameter Measurement Information" in the General Information Section.
Document #: 38-00297-B
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CY54/74FCT138T
Package Diagrams
16-Lead (300-Mil) CerDIP D2
MIL-STD-1835 D-2 Config.A
20-Pin Square Leadless Chip Carrier L61
MIL-STD-1835 C-2A
16-Lead (300-Mil) Molded DIP P1
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CY54/74FCT138T
Package Diagrams (continued)
16-Lead Quarter Size Outline Q1
16-Lead Molded SOIC S1
(c) Cypress Semiconductor Corporation, 1997. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize 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.

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