HD74BC245A Octal Bus Transceivers With 3 State Outputs ADE-205-008A (Z) Rev. 1 March 1993 Description The HD74BC245A provides high drivability and operation equal to or better than high speed bipolar standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC, when the frequency is 10 MHz. The device has ten buffers with three state outputs in a 20 pin package. Each device has an active low enable input G and a direction control input DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is low, data flows from the B inputs to the A outputs. When G is high, disables both A and B ports by placing then in a high impedance. Features • • • • Input/Output are at high impedance state when power supply is off. Built in input pull up circuit can make input pins be open, when not used. TTL level input Wide operating temperature range Ta = –40 to + 85°C Function Table Control Inputs G DiR Operation L L B data to A bus L H A data to B bus H X Z H : L : Z : High level Low level High impedance HD74BC245A Pin Arrangement DiR 1 20 VCC A1 2 19 G A2 3 18 B1 A3 4 17 B2 A4 5 16 B3 A5 6 15 B4 A6 7 14 B5 A7 8 13 B6 A8 9 12 B7 GND 10 11 B8 (Top view) Absolute Maximum Ratings Item Symbol Rating Unit Supply voltage VCC –0.5 to +7.0 V Input diode current I IK ±30 mA Input voltage VIN –0.5 to +7.5 V Output voltage VOUT –0.5 to +7.5 V Off state output voltage VOUT(off) –0.5 to +5.5 V Storage temperature Tstg –65 to +150 °C Note: 2 1. 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. HD74BC245A Recommended Operating Conditions Item Symbol Min Typ Max Unit Supply voltage VCC 4.5 5.0 5.5 V Input voltage VIN 0 — VCC V Output voltage VOUT 0 — VCC V Topr –40 — 85 °C t r, t f 0 — 8 ns/V Operating temperature 1 Input rise/fall time* Note: 1. This item guarantees maximum limit when one input switches. Waveform: Refer to test circuit of switching characteristics. Logic Diagram DiR A1 G B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 3 HD74BC245A Electrical Characteristics (Ta = –40°C to +85°C) Item Symbol Input voltage Output voltage Min Max Unit VIH 2.0 — V VIL — 0.8 V 4.5 2.4 — V I OH = –3 mA 4.5 2.0 — V I OH = –15 mA 4.5 — 0.5 V I OL = 48 mA 4.5 — 0.55 V I OL = 64 mA VOH VOL VCC(V) Test Conditions Input diode voltage VIK 4.5 — –1.2 V I IN = –18 mA Input current II 5.5 — –250 µA VIN = 0 V 5.5 — 100 µA An or Bn, VIN = 5.5 V 5.5 — 1.0 µA DiR or G, VIN = 5.5 V 5.5 — 100 µA DiR or G, VIN = 7.0 V 1 Short circuit output current* I OS 5.5 –100 –225 mA VO = 0 V, VIN = 5.5 V Off state output current I OZH 5.5 — –100 µA VO = 2.7 V I OZL 5.5 — –250 µA VO = 0.5 V I CCL 5.5 — 31.5 mA VIN = 0 or 5.5 V All outputs is “L” I CCH 5.5 — 0.5 mA VIN = 0 or 5.5 V All outputs is “H” I CCZ 5.5 — 4.5 mA VIN = 0 or 5.5 V All outputs is “Z” I CCT*2 5.5 — 1.5 mA VIN = 3.4 or 0.5 V Supply current Notes : 1. Not more than one output should be shorted at a time and duration of the short circuit should not exceed one second. 2. When input by the TTL level, it shows I CC increase at per one input pin. 4 HD74BC245A Switching Test Method (CL = 50 pF) Ta = 25°C VCC = 5.0 V Ta = –40 to 85°C VCC = 5.0 V ±10% Item Symbol Min Max Min Max Unit Test Conditions Propagation delay time t PLH 3.0 6.0 3.0 7.0 ns An to Bn t PHL 3.0 6.0 3.0 7.0 t PLH 3.0 6.0 3.0 7.0 ns Bn to An t PHL 3.0 6.0 3.0 7.0 t ZH 3.0 9.0 3.0 11.0 ns G to Bn t ZL 3.0 9.0 3.0 11.0 t ZH 3.0 9.0 3.0 11.0 ns G to An t ZL 3.0 9.0 3.0 11.0 t HZ 3.0 8.0 3.0 10.0 ns G to Bn t LZ 3.0 8.0 3.0 10.0 t HZ 3.0 8.0 3.0 10.0 ns G to An t LZ 3.0 8.0 3.0 10.0 Input capacitanse CIN 3.0(Typ) — pF VIN = VCC or GND Output capacitance CI/O 15.0(Typ) — pF VI/O = VCC or GND Output enable time Output disable time Test Circuit VCC Input Pulse Generator Zout = 50 Ω See Function Table VCC G Output A1 1. 2. 3. 4. 500 Ω B1 DiR Notes: S1 CL= 50 pF 450 Ω *4 OPEN 7V 50 Ω Scope CL includes probe and jig capacitance. A2-B2, A3-B3, A4-B4, A5-B5, A6-B6, A7-B7, A8-B8 are identical to above load circuit. S1: Input-Output change switch. Open: tPLH, t PHL , t ZH , t HZ 7 V: t ZL, t LZ 5 HD74BC245A Waveforms-1 tr tf 90% 1.5 V Input 3V 90% 1.5 V 10% t PLH 10% 0V t PHL VOH 1.5 V Output 1.5 V VOL Waveforms-2 tf tr 90% 1.5 V G 90% 1.5 V 10% 10% 3V 0V t LZ t ZL 3.5 V 1.5 V Waveform–A VOL + 0.3 V t ZH VOH – 0.3 V Waveform–B VOL t HZ VOH 1.5 V 0V Notes: 1. 2. 3. 4. 6 t r = 2.5 ns, tf = 2.5 ns Input waveform: PRR = 1 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. HD74BC245A Package Dimensions Unit: mm 7 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. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. 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