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74LVC245 Dataheets PDF



Part Number 74LVC245
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description Octal Bidirectional Transceivers
Datasheet 74LVC245 Datasheet74LVC245 Datasheet (PDF)

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 .

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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 L L H H: L: X: Z: High level Low level Immaterial High impedance T/R L H X Operation B data to A bus A data to B bus Z HD74LVC245A Pin Arrangement T/R 1 A0 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 GND 10 20 VCC 19 OE 18 B0 17 B1 16 B2 15 B3 14 B4 13 B5 12 B6 11 B7 (Top view) Absolute Maximum Ratings Item Supply voltage Input diode current Input voltage Output diode current Symbol VCC I IK VI I OK Ratings –0.5 to 6.0 –50 –0.5 to 6.0 –50 50 Input / output voltage VI/O –0.5 to VCC +0.5 –0.5 to 6.0 Output current VCC, GND current / pin Storage temperature IO I CC or IGND Tstg ±50 100 –65 to 150 Unit V mA V mA mA V V mA mA °C VI = –0.5 V T / R, OE VO = –0.5 V VO = VCC +0.5 V Output "H" or "L" Output "Z" or VCC:OFF 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 Supply voltage Symbol VCC Ratings 1.5 to 5.5 2.0 to 5.5 Input / output voltage VI VI/O 0 to 5.5 0 to V CC 0 to 5.5 Operating temperature Output current Ta I OH –40 to 85 –12 –24 I OL *1 *2 Unit V V V V V °C mA mA mA mA ns/V Conditions Data retention At operation T / R, OE Output "H" or "L" Output "Z" or VCC:OFF VCC = 2.7 V VCC = 3.0 V to 5.5 V VCC = 2.7 V VCC = 3.0 V to 5.5 V 12 24 *2 Input rise / fall time t r, t f 10 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 Input voltage Symbol VCC (V) VIH Min Max — Unit V V V I OH = –100 µA I OH = –12 mA Test Conditions 2.7 to 3.6 2.0 4.5 to 5.5 VCC×0.7 — VIL 2.7 to 3.6 — 4.5 to 5.5 — Output voltage VOH 0.8 VCC×0.3 V V V V V V V V V V µA µA µA µA µA µA VIN = 5.5 V or GND VIN = VCC, GND VOUT = 5.5 V or GND VIN / V OUT = 5.5 V VIN / V OUT = 3.6 to 5.5 V VIN = VOUT or GND VIN = one input at (VCC –0.6)V, other inputs at V CC or GND I OL = 100 µA I OL = 12 mA I OL = 24 mA I OH = –24 mA 2.7 to 5.5 VCC –0.2 — 2.7 3.0 3.0 4.5 2.2 2.4 2.2 3.8 — — — — 0.2 0.4 0.55 0.55 ±5.0 ±5.0 20 ±10 10 500 VOL 2.7 to 5.5 — 2.7 3.0 4.5 — — — — Input current Off state output current I IN I OZ I OFF 0 to 5.5 2.7 to 5.5 — Output leak current 0 — Quiescent supply current I CC ∆ I CC 2.7 to 3.6 — 2.7 to 5.5 — 3.0 to 3.6 — 4 HD74LVC245A Switching Characteristics Ta = –40 to 85°C Item Propagation delay time Symbol VCC (V) t PLH t PHL 2.7 3.3±0.3 5.0±0.5 Output enable time t ZH t ZL 2.7 3.3±0.3 5.0±0.5 Output disable time t ZH t LZ *1 Min — 1.5 — — 1.5 — — 1.5 — — — — — — Typ — — — — — — — — — — — — 3.0 15.0 Max 8.0 7.0 5.5 9.5 8.5 7.0 8.5 7.5 6.5 — 1.0 1.0 — — Unit ns ns ns ns ns ns ns ns ns ns ns ns pF pF From (Input) To (Output) A or B B or A OE A or B 2.7 3.3±0.3 5.0±0.5 OE A or B Between outut pins skew t OSLH t OSHL 2.7 3.3±0.3 5.0±0.5 Input capacitance Output capacitance Note: CIN CO 2.7 2.7 1. This parameter is characterized but not tested. tosLH = | tPLHm - tPLHn |, tosHL = | tPHLm - tPHLn| 5 HD74LVC245A Test Circuit VCC VCC OE See Function Table Input Pulse Generator Zout = 50 Ω Output A0 B0 CL = 50 pF T/R S2 Vcc=2.7V, 3.3±0.3V Vcc=5.0±0.5V S1 500 Ω 450 Ω 50 Ω Scope S2 OPEN See under table GND *1 Symbol t PLH / t PHL t ZH/ t HZ t ZL / t LZ Note: 1. CL includes probe and jig capacitance. OPEN GND 6V OPEN GND 2×Vcc Waveforms – 1 tr 90 % Input Vref 10 % t PLH Vref 90 % Vref 10 % t PHL VOH In phase output Vref VOL tf VIH GND 6 HD74LVC245A Waveforms – 2 tf OE 90 % Vref 10 % t ZL Waveform - A t ZH Waveform - B Vref Vref t HZ VOH – 0.3 V tr 90 % Vref 10 % t LZ VIH GND ≈V OH1 VOL + 0.3 V 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 1.5 V 3V GND Vcc 50%Vcc Vcc GND 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.


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