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| DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The MC54/74F253 is a Dual 4-Input Multiplexer with 3-State Outputs. It can select two bits of data from four sources using common select inputs. The outputs may be individually switched to a high-impedance state with a HIGH on the respective Output Enable (OE) inputs, allowing the outputs to interface directly with bus-oriented systems. MC54/74F253 DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS FASTTM SCHOTTKY TTL CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 OEb 15 S0 14 I3b 13 I2b 12 I1b 11 I0b 10 Zb 9 16 1 J SUFFIX CERAMIC CASE 620-09 16 1 N SUFFIX PLASTIC CASE 648-08 1 OEa 2 S1 3 I3a 4 I2a 5 I1a 6 I0a 7 Za 8 GND 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC GUARANTEED OPERATING RANGES Symbol VCC TA Parameter Supply Voltage Operating Ambient Temperature Range 54, 74 54 74 IOH IOL Output Current -- High Output Current -- Low 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -3.0 24 mA mA Unit V C FAST AND LS TTL DATA 4-120 MC54/74F253 LOGIC DIAGRAM OEb 15 13b 13 12b 12 11b 11 10b 10 S0 14 S1 2 13a 3 12a 4 11a 5 10a 6 OEa 1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS Zb 9 Za 7 FUNCTIONAL DESCRIPTION The F253 contains two identical 4-input Multiplexers with 3-State Outputs. They select two bits from four sources selected by common Select Inputs (S0, S1). The 4-input multiplexers have individual Output Enable (OEa, OEb) inputs which, when HIGH, force the outputs to a high impedance (high Z) state. The F253 is the logic implementation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels supplied to the two select inputs. The logic equations for the outputs are shown below: FUNCTION TABLE Select Inputs S0 X L L H H L L H H S1 X L L L L H H H H I0 X L H X X X X X X Data Inputs I1 X X X L H X X X X I2 X X X X X L H X X I3 X X X X X X X L H Output Enable OE H L L L L L L L L Output Z Z L H L H L H L H H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance (off) Address inputs S0 and S1 are common to both sections. Za = OEa * (I0a * S1 * S0 + I1a * S1 * S0 + I2a * S1 * S0 + 13a * S1 * S0) Zb = OEb * (I0b * S1 * S0 + I1b * S1 * S0 + I2b * S1 * S0 + I3b * S1 * S0) If the outputs of 3-state devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. Designers should ensure that Output Enable signals to 3-state devices whose outputs are tied together are designed so that there is no overlap. FAST AND LS TTL DATA 4-121 MC54/74F253 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 74 VOL IOZH IOZL IIH Output LOW Voltage Output Off Current -- HIGH Output Off Current -- LOW Input HIGH Current 2.4 2.7 0.5 50 -50 20 100 IIL IOS Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current Total, Output HIGH ICC Total, Output LOW Total at HIGH-Z 16 23 23 mA -60 -0.6 -150 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A A A A mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage IIN = -18 mA IOH = -3.0 mA IOH = -3.0 mA IOL = 24 mA VOUT = 2.7 V VOUT = 0.5 V VIN = 2.7 V VIN = 7.0 V VIN = 0.5 V VOUT = 0 V OEn = GND IO = 4.5 V; Sn, I1 - I3 = GND In, Sn, OEn = GND VCC = MAX OEn = 4.5 V, VCC = MAX In, Sn = GND VCC = MAX VCC = MAX VCC = MIN VCC = 4.50 V VCC = 4.75 V VCC = MIN VCC = MAX VCC = MAX VCC = MAX AC CHARACTERISTICS 54/74F TA = +25C VCC = +5.0 V CL = 50 pF Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Output Disable Time Parameter Propagation Delay Sn to Zn Propagation Delay In to Zn Output Enable Time Min 4.5 3.0 3.0 2.5 3.0 3.0 2.0 2.0 Max 11.5 9.0 7.0 6.0 8.0 8.0 5.0 6.0 54F TA = -55C to +125C VCC = 5.0 V 10% CL = 50 pF Min 3.5 2.5 2.5 2.5 2.5 2.5 2.0 2.0 Max 15 11 9.0 8.0 10 10 6.5 8.0 74F TA = 0C to +70C VCC = 5.0 V 10% CL = 50 pF Min 4.5 3.0 3.0 2.5 3.0 3.0 2.0 2.0 Max 13.5 10 8.0 7.0 9.0 9.0 6.0 7.0 ns ns ns Unit ns FAST AND LS TTL DATA 4-122 |
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