HD74HC242/HD74HC243 Quad. Bus Transceivers (with 3-state outputs) Quad. Bus Transceivers (with noninverted 3-state outputs) Description The HD74HC242 is an inverting buffer and the HD74HC243 is a noninverting buffer. Each device has one active high enable (GBA), and one active low enable (GAB). GBA enables the A output and GAB enables the B outputs. The device does not have schmitt trigger inputs. Features • • • • • High Speed Operation: tpd = 10 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Control inputs HD74HC242 HC74HC243 Data Port Status Data Port Status GAB GBA A B A B H H O I O I L H Z Z Z Z H L Z Z Z Z L L I O I O I O O Z : : : : Input Output Inverting Output Hight Impedance HD74HC242/HD74HC243 Pin Arrangement HD74HC242 GAB 1 14 VCC NC 2 13 GBA 1A 3 12 NC 2A 4 11 1B 3A 5 10 2B 4A 6 9 3B GND 7 8 4B (Top view) HD74HC243 GAB 1 14 VCC NC 2 13 GBA 1A 3 12 NC 2A 4 11 1B 3A 5 10 2B 4A 6 9 3B GND 7 8 4B (Top view) 2 HD74HC242/HD74HC243 Absolute Maximum Ratings Item Symbol Rating Unit Supply voltage range VCC –0.5 to +7.0 V Input voltage VIN –0.5 to VCC + 0.5 V Output voltage VOUT –0.5 to VCC + 0.5 V DC current drain per pin I OUT ±35 mA DC current drain per VCC, GND I CC, I GND ±75 mA DC input diode current I IK ±20 mA DC output diode current I OK ±20 mA Power Dissipation per package PT 500 mW Storage temperature Tstg –65 to +150 °C Logic Diagram HD74HC242 1 of 4 Transceivers A VCC VCC B GBA GAB 3 HD74HC242/HD74HC243 HD74HC243 1 of 4 Transceivers A VCC VCC B GBA GAB 4 HD74HC242/HD74HC243 DC Characteristics Ta = –40 to +85°C Ta = 25°C Item Symbol VCC (V) Min Typ Max Min Max Unit Input voltage VIH 2.0 1.5 — — 1.5 — V 4.5 3.15 — — 3.15 — 6.0 4.2 — — 4.2 — 2.0 — — 0.5 — 0.5 4.5 — — 1.35 — 1.35 6.0 — — 1.8 — 1.8 2.0 1.9 2.0 — 1.9 — 4.5 4.4 4.5 — 4.4 — 6.0 5.9 6.0 — 5.9 — 4.5 4.18 — — 4.13 — I OH = –6 mA 6.0 5.68 — — 5.63 — I OH = –7.8 mA 2.0 — 0.0 0.1 — 0.1 4.5 — 0.0 0.1 — 0.1 6.0 — 0.0 0.1 — 0.1 4.5 — — 0.26 — 0.33 I OL = 6 mA 6.0 — — 0.26 — 0.33 I OL = 7.8 mA VIL Output voltage VOH VOL Test Conditions V V V Vin = VIH or VIL I OH = –20 µA Vin = VIH or VIL I OL = 20 µA Off-state output current I OZ 6.0 — — ±0.5 — ±5.0 µA Vin = VIH or VIL, Vout = VCC or GND Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND Quiescent supply current I CC 6.0 — — 4.0 40 µA Vin = VCC or GND, Iout = 0 µA — 5 HD74HC242/HD74HC243 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C VCC (V) Min Typ Max Min Max Unit Propagation delay t PHL 2.0 — — 90 — 115 ns time 4.5 — 10 18 — 23 6.0 — — 15 — 20 2.0 — — 90 — 115 4.5 — 10 18 — 23 6.0 — — 15 — 20 2.0 — — 150 — 190 4.5 — 14 30 — 38 6.0 — — 26 — 33 2.0 — — 150 — 190 4.5 — 15 30 — 38 6.0 — — 26 — 33 2.0 — — 150 — 190 4.5 — 18 30 — 38 6.0 — — 26 — 33 2.0 — — 150 — 190 4.5 — 20 30 — 38 6.0 — — 26 — 33 Item Symbol t PLH Output enable t ZL time t ZH Output disable t LZ time t HZ Output rise/fall t TLH 2.0 — — 60 — 75 time t THL 4.5 — 4 12 — 15 6.0 — — 10 — 13 — — 5 10 — 10 Input capacitance 6 Cin ns ns ns ns ns ns pF Test Conditions Unit: mm 19.20 20.32 Max 8 6.30 7.40 Max 14 1.30 7 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 2.39 Max 2.54 Min 5.06 Max 1 7.62 + 0.10 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-14 Conforms Conforms 0.97 g Unit: mm 10.06 10.5 Max 8 5.5 14 1 0.10 ± 0.10 1.42 Max 1.27 *0.42 ± 0.08 0.40 ± 0.06 *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 7 + 0.20 7.80 – 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-14DA — Conforms 0.23 g Unit: mm 8.65 9.05 Max 8 1 7 *0.20 ± 0.05 0.635 Max 1.75 Max 3.95 14 + 0.10 6.10 – 0.30 1.08 *0.40 ± 0.06 0.11 0.14 +– 0.04 0° – 8° 1.27 0.67 0.60 +– 0.20 0.15 0.25 M *Pd plating Hitachi Code JEDEC EIAJ Weight (reference value) FP-14DN Conforms Conforms 0.13 g Cautions 1. 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