74HC155

HD74HC155 Dual 2-to-4-line Decoders/Demultiplexers Description This circuit features dual 1-line-to-4-line demultiplexer with individual strobes and common binary-address input. When both sections are enabled by the strobes, the common binary-address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections as desired. Data applied to input 1C is inverted through its outputs. The inverter following the 1C data input permits use as a 3-to-8-line decoder or 1-to-8line demultiplexer without external gating. Features • • • • • High Speed Operation: tpd (A or B to Y) = 15 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table 2-line-to-4-line Decoder/1-line-to-4-line Demultiplexer Inputs Select B X L L H H X A X L H L H X Strobe 1G H L L L L X Data 1C X H H H H L Outputs 1Y0 H L H H H H 1Y1 H H L H H H 1Y2 H H H L H H 1Y3 H H H H L H HD74HC155 Inputs Select B X L L H H X A X L H L H X Strobe 2G H L L L L X Data 2C X L L L L H Outputs 2Y0 H L H H H H 2Y1 H H L H H H 2Y2 H H H L H H 2Y3 H H H H L H 3-line-to-8-line Decoder/1-line-to-8-line Demultiplexer Inputs Select C X L L L L H H H H B X L L H H L L H H A X L H L H L H L H Strobe Data G H L L L L L L L L Outputs 0 2Y0 H L H H H H H H H 1 2Y1 H H L H H H H H H 2 2Y2 H H H L H H H H H 3 2Y3 H H H H L H H H H 4 1Y0 H H H H H L H H H 5 1Y1 H H H H H H L H H 6 1Y2 H H H H H H H L H 7 1Y3 H H H H H H H H L Notes: 1. C: inputs 1C and 2C connected together 2. G: inputs 1G and 2G connected together 3. X: irrelevant 2 HD74HC155 Pin Arrangement Data 1 1C Strobe 1G 2 Select Input B 3 1Y3 4 1Y2 5 Outputs 1Y1 6 1Y0 7 GND 8 (Top view) 1Y1 1Y0 1Y3 1Y2 B B A A B B A A 2Y1 2Y0 1C 1G 16 VCC 15 Data 2C Strobe 14 2G Select 13 Input A 2C 2G 2Y3 2Y2 12 2Y3 11 2Y2 Outputs 10 2Y1 9 2Y0 3 HD74HC155 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 40 µA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 — 3.15 — 4.2 — — — — — — — — — — 0.5 1.5 3.15 4.2 — VIL 2.0 4.5 6.0 1.35 — 1.8 — 1.9 4.4 5.9 4.13 5.63 — — — Output voltage VOH 2.0 4.5 6.0 4.5 6.0 1.9 2.0 — 4.4 4.5 — 5.9 6.0 — 4.18 — 5.68 — — — — — — — — — — VOL 2.0 4.5 6.0 4.5 6.0 0.0 0.1 0.0 0.1 0.0 0.1 — — — — 0.26 — 0.26 — ±0.1 — 4.0 — Input current Quiescent supply current Iin I CC 6.0 6.0 4 HD74HC155 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25°C Item Symbol Ta = –40 to +85°C Max 200 40 34 200 40 34 180 36 31 95 19 16 10 pF ns 1C to Y A or B to Y Unit ns Test Conditions A, B, 2C, 1G or 2G to Y VCC (V) Min Typ Max Min 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 — — — — — — — — — — — — — — 13 — — 15 — — 14 — — 5 — 5 160 — 32 27 — — Propagation delay t PLH time t PHL 160 — 32 27 — — 145 — 29 25 75 15 13 10 — — — — — — Output rise/fall time t TLH t THL 2.0 4.5 6.0 Input capacitance Cin — 5 19.20 20.00 Max 16 9 7.40 Max 6.30 Unit: mm 1 1.3 1.11 Max 8 0.51 Min 2.54 Min 5.06 Max 7.62 2.54 ± 0.25 0.48 ± 0.10 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) + 0.13 DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 16 9 5.5 1 *0.22 ± 0.05 0.20 ± 0.04 8 0.80 Max 2.20 Max 0.20 7.80 + 0.30 – 1.15 0° – 8° 0.70 ± 0.20 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.12 M Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DA — Conforms 0.24 g *Dimension including the plating thickness Base material dimension 0.10 ± 0.10 0.15 Unit: mm 9.9 10.3 Max 16 9 3.95 1 1.27 0.635 Max 8 0.11 0.14 + 0.04 – 1.75 Max *0.22 ± 0.03 0.20 ± 0.03 0.10 6.10 + 0.30 – 1.08 0° – 8° 0.67 0.60 + 0.20 – *0.42 ± 0.08 0.40 ± 0.06 0.15 0.25 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DN Conforms Conforms 0.15 g Cautions 1. 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