HD74BC620A Octal Bus Transceivers With 3 State Outputs ADE-205-024 (Z) Rev. 0 June 1993 Description The HD74BC620A 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 eight bus transceivers with three state outputs in a 20 pin package. This device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic levels at the enable inputs (GBA and GAB). The enable inputs can be used to disable the device so that the buses are effectively isolated. Features • • • • Input/Output are at high impedance state when power supply is off. Input pins can be open, when not used, owing to built in input pull up circuit. Input is TTL level. Wide operating temperature range Ta = –40 to +85°C. Function Table Enable Inputs GBA GAB Operation L L B data to A bus H H A data to B bus H L Isolation L H B data to A bus A data to B bus H : L : High level Low level HD74BC620A Pin Arrangement GAB 1 20 VCC A1 2 19 GBA 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. HD74BC620A 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 Ouput 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 GBA GAB A1 B1 A2 B2 A3 B3 A8 B8 3 HD74BC620A Electrical Characteristics (Ta = –40 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 — 1.0 µA GAB or GBA, VIN = 5.5 V 5.5 — 100 µA An or Bn, VIN = 5.5 V 5.5 — 100 µA GAB or GBA = 7 V I OS 5.5 –100 –225 mA VIN = 0 or 5.5 V I OZH 5.5 — –100 µA VO = 2.7 V I OZL 5.5 — –250 µA VO = 0.5 V I CCL 5.5 — 29.5 mA VIN = 0 or 5.5 V All outputs is “L” I CCH 5.5 — 2.5 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 Output short circuit current* Off state output current Supply current 1 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 HD74BC620A Switching Characteristics (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 GAB to Bn t ZL 3.0 9.0 3.0 11.0 t ZH 3.0 9.0 3.0 11.0 ns GBA to An t ZL 3.0 9.0 3.0 11.0 t HZ 3.0 8.0 3.0 10.0 ns GAB to Bn t LZ 3.0 8.0 3.0 10.0 t HZ 3.0 8.0 3.0 10.0 ns GBA to An t LZ 3.0 8.0 3.0 10.0 Input capacitance 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 5 HD74BC620A Test Circuit VCC VCC Input Pulse Generator Zout = 50 Ω See Function Table GBA Output A1 S1 500 Ω B1 CL = 50 pF 450 Ω OPEN 7V *4 50 Ω Scope GAB Notes: 1. 2. 3. 4. CL includes probe and jig capacitance. A2-B2 to A8-B8 are identical to above load circuit. S1: Input-Output change switch. Open: tPLH, t PHL , t ZH tHZ 7 V: t ZL, t LZ Waveforms-1 tf Input tr 90 % 1.5 V 10 % 90 % 1.5 V 10 % t PHL t PLH 3V 0V VOH Output 1.5 V 1.5 V VOL 6 HD74BC620A Waveforms-2 tr tf 90 % 1.5 V 10 % t ZL GAB 3V 90 % 1.5 V 10 % 0V t LZ 3.5 V Waveform – A 1.5 V VOL + 0.3 V t ZH t HZ VOH – 0.3 V 1.5 V Waveform – B VOL VOH 0V Waveforms-3 tf GBA tr 90 % 1.5 V 10 % 3V 90 % 1.5 V 10 % t LZ t ZL 0V 3.5 V Waveform – A 1.5 V VOL + 0.3 V t ZH Waveform – B t HZ 1.5 V VOH – 0.3 V VOL VOH 0V Notes: 1. tr = 2.5 ns, tf = 2.5 ns 2. Input waveforms: PRR = 1 MHz, duty cycle 50% 3. Waveform-A shows input conditions such that the output is “L” level when enable by the output control. 4. Waveform-B shows input conditions such that the output is “H” level when enable by the output control. 7 HD74BC620A Package Dimensions Unit: mm 8 Cautions 1. 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