Details, datasheet, quote on part number: CY5474FCT245T
CategoryCommunication => Telephony => Tone Decoder
Description1-of-8 Decoder
CompanyTexas Instruments, Inc.
DatasheetDownload CY5474FCT245T datasheet


Features, Applications

Data sheet acquired from Cypress Semiconductor Corporation. Data sheet modified to remove devices not offered.

Source current 32 mA (Com'l), 12 mA (Mil) Dual 1-of-8 decoder with enables

Function, pinout, and drive compatible with FCT and F logic FCT-C speed 5.0 ns max. (Com'l), FCT-A speed 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 to +85C Sink current 64 mA (Com'l), 32 mA (Mil)

The a 1-of-8 decoder. The FCT138T accepts three binary weighted inputs A1, A2) and, when enabled, provides eight mutually exclusive active LOW outputs (O0O7). 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 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.

Name E3 O Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs Description

(Above which the useful life may be impaired. For user guidelines, not tested.) Storage to +150C Ambient Temperature with Power to +135C Supply Voltage to Ground Potential............... +7.0V DC Input Voltage............................................ +7.0V DC Output Voltage......................................... +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)

Parameter 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

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 Mil Com'l Mil

2.0 All inputs VCC=Min., IIN=18 mA VCC=Max., VIN=VCC VCC=Max., VIN=2.7V VCC=Max., VIN=0.5V VCC=Max., VCC=0V, VOUT=4.5V

Input Clamp Diode Voltage Input HIGH Current Input HIGH Current Input LOW Current Output Short Circuit Current[7] Power-Off Disable

Notes: 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 VCC or ground. TA is the "instant on" case temperature. 5. Typical values are VCC=5.0V, TA=+25C ambient. 6. This parameter is specified 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.

Parameter CIN COUT Input Capacitance Output Capacitance Description 5 9 Max. 10 12 Unit pF

Parameter 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 > VCC0.2V 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 > VCC0.2V VCC=Max., f1=10 MHz, 50% Duty Cycle, Outputs Open, Toggle or E3, One Output Toggling, VIN 0.2V or VIN > VCC0.2V VCC=Max., f1=10 MHz, 50% Duty Cycle, Outputs Open, Toggle 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 + f1N1) ICC = Quiescent Current with CMOS input levels ICC = Power Supply Current for a TTL HIGH input DH = Duty Cycle for TTL inputs HIGH = Number of TTL inputs DH NT ICCD = Dynamic Current caused by an input transition pair (HLH or LHL) = Clock frequency for registered devices, otherwise zero f0 = Input signal frequency f1 = Number of inputs changing f1 N1 All currents are in milliamps and all frequencies are in megahertz.


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