HD74HCT125/HD74HCT126 Quad. Bus Buffer Gates (with 3-state outputs) Description The HD74HCT125, HD74HCT126 require the 3-state control input C to be taken high to put the output into the high impedance condition, whereas the HD74HCT125, HD74HCT126 requires the control input to be low to put the output into high impedance. Features • • • • • • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A to Y) = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 4.5 to 5.5 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Input C Output Y HCT125 HCT126 A HD74HCT125 HD74HCT126 H L X Z Z L H L L L L H H H H Notes: X: Irrelevant Z: Off (High-impedance) state of a 3-state output. HD74HCT125/HD74HCT126 Pin Arrangement HD74HCT125 1C 1 14 VCC 1A 2 13 4C 1Y 3 12 4A 2C 4 11 4Y 2A 5 10 3C 2Y 6 9 3A GND 7 8 3Y (Top view) HD74HCT126 1C 1 14 VCC 1A 2 13 4C 1Y 3 12 4A 2C 4 11 4Y 2A 5 10 3C 2Y 6 9 3A GND 7 8 3Y (Top view) 2 HD74HCT125/HD74HCT126 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 Output current 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 DC Characteristics Ta = –40 to +85°C Ta = 25°C Test Conditions Item Symbol Min Typ Max Min Max Unit VCC (V) Input voltage VIH 2.0 — — — V 4.5 to 5.5 VIL — — 0.8 — 0.8 V 4.5 to 5.5 VOH 4.4 — — 4.4 — V 4.5 Vin = VIH or VIL I OH = –20 µA 4.18 — — 4.13 — 4.5 I OH = –6 mA — — 0.1 — 0.1 — — 0.26 — 0.33 Output voltage VOL 2.0 V 4.5 Vin = VIH or VIL I OL = 20 µA 4.5 I OL = 6 mA Off-state output current I OZ — — ±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL, Vout = VCC or GND Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND Quiescent supply current I CC — — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA 3 HD74HCT125/HD74HCT126 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C Test Conditions Min Typ Max Min Max Unit VCC (V) Propagation delay t PHL — 12 20 — 25 ns 4.5 time t PLH — 12 20 — 25 Output enable t ZL — 12 30 — 38 time t ZH — 12 30 — 38 Output disable t LZ — 15 30 — 38 time t HZ — 15 30 — 38 Output rise/fall t TLH — 4 12 — 15 time t THL — 4 12 — 15 Input capacitance Cin — 5 10 — 10 Item 4 Symbol 4.5 ns 4.5 4.5 ns 4.5 4.5 ns 4.5 4.5 pF — 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 Unit: mm 4.40 5.00 5.30 Max 14 8 1 7 0.65 0.20 ± 0.06 1.0 0.13 M 6.40 ± 0.20 0.10 *Dimension including the plating thickness Base material dimension *0.17 ± 0.05 0.15 ± 0.04 1.10 Max 0.83 Max 0.07 +0.03 –0.04 *0.22+0.08 –0.07 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-14D — — 0.05 g Cautions 1. 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