HD74LVC138 3-to-8-line Decoder / Demultiplexer ADE-205-068B(Z) Rev.2 September 1995 Description The HD74LVC138 has three binary select inputs in a 16 pin package. If the device is enabled these inputs determine which one of the eight normally high outputs will go low. Two active low and one active high enables are provided to ease the cascading of decoders. 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) 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) HD74LVC138 Function Table Inputs Enable Select Outputs G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X H H H H H H H H X H X X X X H H H H H H H H L X X X X X H H H H H H H H H L L L L L L H H H H H H H H L L L L H H L H H H H H H H L L L H L H H L H H H H H H L L L H H H H H L H H H H H L L H L L H H H H L H H H H L L H L H H H H H H L H H H L L H H L H H H H H H L H H L L H H H H H H H H H H L H: L: X: High level Low level Immaterial Pin Arrangement 16 VCC A 1 B 2 B C 3 A Y0 15 Y0 C Y1 14 Y1 G2A 4 G2A Y2 13 Y2 G2B 5 G2B Y3 12 Y3 G1 6 G1 Y4 11 Y4 Y7 7 Y7 Y5 10 Y5 Y6 9 Y6 GND 8 (Top view) 2 HD74LVC138 Absolute Maximum Ratings Item Symbol Ratings Unit Supply voltage VCC –0.5 to 6.0 V Input diode current I IK –50 mA Input voltage VI –0.5 to 6.0 V Output diode current I OK –50 mA VO = –0.5 V 50 mA VO = VCC +0.5 V Output voltage VO –0.5 to VCC +0.5 V Output current IO ±50 mA VCC, GND current / pin I CC or IGND 100 mA Storage temperature Tstg –65 to +150 °C Conditions VI = –0.5 V 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. 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 G, A, B, C VO 0 to V CC V Y0 to Y7 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 Input / output voltage *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 HD74LVC138 Electrical Characteristics Ta = –40 to 85°C Item Symbol VCC (V) Input voltage VIH VIL Output voltage VOH VOL Input current I IN Quiescent supply current I CC ∆I CC Min Max Unit 2.7 to 3.6 2.0 — 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 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 2.0 — 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 0 to 5.5 — ±5.0 µA VIN = 5.5 V or GND 5.5 — 20 µA VIN = VCC or GND 500 µA VIN = one input at(VCC –0.6)V, other inputs at V CC or GND 3.0 to 3.6 — I OH = –24 mA 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 — 7.0 10.0 ns G, A, B, C t PHL 3.3±0.3 1.5 5.0 9.0 ns 5.0±0.5 — 3.5 7.5 ns Input capacitance CIN 2.7 — 3.0 — pF Output capacitance CO 2.7 — 15.0 — pF 4 Y0 to Y 7 HD74LVC138 Test Circuit VCC VCC Input Pulse Generator Zout = 50 Ω See Function Table A B Output Y 0 to Y 7 C CL = 50 pF 450 Ω 50 Ω Scope G1 G 2A G 2B Note: 1. CL includes probe and jig capacitance. 5 HD74LVC138 Waveforms tr tf 90 % Input VIH 90 % Vref Vref 10 % 10 % t PLH GND t PHL VOH In phase output Vref Vref VOL t PHL t PLH VOH Out of phase output Vref Vref VOL Symbol VIH Vref Notes: 6 1. 2. t r = 2.5 ns, tf = 2.5 ns Input waveform : PRR = 10 MHz, duty cycle 50% VCC = 2.7 V, 3.3±0.3 V VCC = 5.0±0.5 V 2.7 V VCC 1.5 V 50%VCC Unit: mm 4.40 5.00 5.30 Max 16 9 1 8 0.65 0.13 M 1.10 Max 0.65 Max 0.10 *Dimension including the plating thickness Base material dimension 6.40 ± 0.20 0.07 +0.03 –0.04 0.20 ± 0.06 1.0 *0.17 ± 0.05 0.15 ± 0.04 0.08 *0.22 +– 0.07 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-16DA — — 0.05 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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