HD74LVC245A Octal Bidirectional Transceivers with 3-state Outputs ADE-205-111B(Z) 3rd Edition December 1996 Description The HD74LVC245A has eight buffers with three state outputs in a 20 pin package. When (T / R) is high, data flows from the A inputs to the B outputs, and when (T / R) is low, data flows from the B inputs to the A outputs. A and B bus are separated by making enable input (OE) high level. Low voltage and high speed operation is suitable at the battery drive product (note type personal computer) and low power consumption extends the life of a battery for long time operation. Features • • • • • • VCC = 2.0 V to 5.5 V All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V) All input outputs VI/O (Max.) = 5.5 V (@VCC = 0 V or output off state) Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C) Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C) High output current ±24 mA (@VCC = 3.0 V to 5.5 V) Function Table Inputs OE T/R Operation L L B data to A bus L H A data to B bus H X Z H: L: X: Z: High level Low level Immaterial High impedance HD74LVC245A Pin Arrangement T/R 1 20 VCC A0 2 19 OE A1 3 18 B0 A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 GND 10 11 B7 (Top view) Absolute Maximum Ratings Item Symbol Ratings Unit Supply voltage VCC –0.5 to 6.0 V Input diode current I IK –50 mA VI = –0.5 V Input voltage VI –0.5 to 6.0 V T / R, OE Output diode current I OK –50 mA VO = –0.5 V 50 mA VO = VCC +0.5 V –0.5 to VCC +0.5 V Output "H" or "L" –0.5 to 6.0 V Output "Z" or VCC:OFF Input / output voltage VI/O Output current IO ±50 mA VCC, GND current / pin I CC or IGND 100 mA Storage temperature Tstg –65 to 150 °C Conditions Note: The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 2 HD74LVC245A Recommended Operating Conditions Item Symbol Ratings Unit Conditions Supply voltage VCC 1.5 to 5.5 V Data retention 2.0 to 5.5 V At operation VI 0 to 5.5 V T / R, OE VI/O 0 to V CC V Output "H" or "L" 0 to 5.5 V Output "Z" or VCC:OFF Input / output voltage Operating temperature Ta –40 to 85 °C Output current I OH –12 mA VCC = 2.7 V –24 mA VCC = 3.0 V to 5.5 V 12 mA VCC = 2.7 V 24 mA VCC = 3.0 V to 5.5 V 10 ns/V *2 I OL *2 Input rise / fall time *1 t r, t f Notes: 1. This item guarantees maximum limit when one input switches. Waveform : Refer to test circuit of switching characteristics. 2. duty cycle ≤ 50% 3 HD74LVC245A Electrical Characteristics Ta = –40 to 85°C Item Symbol VCC (V) Input voltage VIH VIL Output voltage VOH VOL Min Max Unit — V 4.5 to 5.5 VCC×0.7 — V 2.7 to 3.6 — 0.8 V 4.5 to 5.5 — VCC×0.3 V 2.7 to 3.6 2.0 Test Conditions 2.7 to 5.5 VCC –0.2 — V I OH = –100 µA 2.7 2.2 — V I OH = –12 mA 3.0 2.4 — V 3.0 2.2 — V 4.5 3.8 — V 2.7 to 5.5 — 0.2 V I OL = 100 µA 2.7 — 0.4 V I OL = 12 mA 3.0 — 0.55 V I OL = 24 mA 4.5 — 0.55 V I OH = –24 mA Input current I IN 0 to 5.5 — ±5.0 µA VIN = 5.5 V or GND Off state output current I OZ 2.7 to 5.5 — ±5.0 µA VIN = VCC, GND VOUT = 5.5 V or GND Output leak current I OFF Quiescent supply current I CC ∆I CC 4 20 µA VIN / V OUT = 5.5 V 2.7 to 3.6 — ±10 µA VIN / V OUT = 3.6 to 5.5 V 2.7 to 5.5 — 10 µA VIN = VOUT or GND 3.0 to 3.6 — 500 µA VIN = one input at (VCC –0.6)V, other inputs at V CC or GND 0 — HD74LVC245A Switching Characteristics Ta = –40 to 85°C Item Symbol VCC (V) Min Typ Max Unit From (Input) To (Output) Propagation delay time t PLH 2.7 — — 8.0 ns A or B B or A t PHL 3.3±0.3 1.5 — 7.0 ns 5.0±0.5 — — 5.5 ns t ZH 2.7 — — 9.5 ns OE A or B t ZL 3.3±0.3 1.5 — 8.5 ns 5.0±0.5 — — 7.0 ns t ZH 2.7 — — 8.5 ns OE A or B t LZ 3.3±0.3 1.5 — 7.5 ns 5.0±0.5 — — 6.5 ns t OSLH 2.7 — — — ns t OSHL 3.3±0.3 — — 1.0 ns 5.0±0.5 — — 1.0 ns Output enable time Output disable time Between outut pins skew *1 Input capacitance CIN 2.7 — 3.0 — pF Output capacitance CO 2.7 — 15.0 — pF Note: 1. This parameter is characterized but not tested. tosLH = | tPLHm - tPLHn |, tosHL = | tPHLm - tPHLn| 5 HD74LVC245A Test Circuit VCC VCC Input Pulse Generator Zout = 50 Ω See Function Table OE Output A0 S1 500 Ω S2 OPEN See under table GND *1 B0 CL = 50 pF 450 Ω 50 Ω Scope T/R Symbol t PLH / t PHL t ZH/ t HZ t ZL / t LZ Note: 1. S2 Vcc=2.7V, 3.3±0.3V Vcc=5.0±0.5V OPEN GND OPEN GND 6V 2×Vcc CL includes probe and jig capacitance. Waveforms – 1 tr tf 90 % Input VIH 90 % Vref Vref 10 % 10 % GND t PHL t PLH VOH In phase output Vref Vref VOL 6 HD74LVC245A Waveforms – 2 tf tr 90 % Vref 10 % OE VIH 90 % Vref 10 % t LZ t ZL GND ≈V OH1 Vref Waveform - A t ZH Waveform - B VOL + 0.3 V t HZ VOH – 0.3 V Vref VOL VOH ≈V OL1 TEST VIH Vref VOH1 VOL1 Notes: 1. 2. 3. 4. Vcc=2.7V, 3.3±0.3V Vcc=5.0±0.5V 2.7 V Vcc 1.5 V 3V 50%Vcc GND GND Vcc tr = 2.5 ns, tf = 2.5 ns Input waveform : PRR = 10 MHz, duty cycle 50% Waveform – A shows input conditions such that the output is "L" level when enable by the output control. Waveform – B shows input conditions such that the output is "H" level when enable by the output control. 7 Unit: mm 6.50 6.80 Max 11 1 10 4.40 20 0.65 *0.22+0.08 –0.07 0.20 ± 0.06 1.0 0.13 M 6.40 ± 0.20 *Dimension including the plating thickness Base material dimension 0.07 +0.03 –0.04 0.10 *0.17 ± 0.05 0.15 ± 0.04 1.10 Max 0.65 Max 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-20DA — — 0.07 g Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. 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