74HC148

HD74HC148 8-to-3-line Octal Priority Encoder Description The HD74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) is provided to allow octal expansion without the need for external circuitry. The data inputs and outputs are active at the low logic level. Features • • • • • High Speed Operation: tpd (0 - 7 to A0 - A2) = 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 Inputs EI H L L L L L L L L L H: L: X: 0 X H X X X X X X X L 1 X H X X X X X X L H High level Low level Irrelevant 2 X H X X X X X L H H 3 X H X X X X L H H H 4 X H X X X L H H H H 5 X H X X L H H H H H 6 X H X L H H H H H H 7 X H L H H H H H H H Outputs A2 H H L L L L H H H H A1 H H L L H H L L H H A0 H H L H L H L H L H GS H H L L L L L L L L EO H L H H H H H H H H HD74HC148 Pin Arrangement 41 52 Inputs 63 74 EI 5 A2 6 Outputs A1 7 GND 8 (Top view) A1 A0 0 5 6 7 EI A2 4 EO GS 3 2 1 16 VCC 15 EO Outputs 14 GS 13 3 12 2 Inputs 11 1 10 0 9 A0 Output 2 HD74HC148 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 3 HD74HC148 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25°C Item Symbol Ta = –40 to +85°C Max 290 58 49 315 63 54 340 68 58 290 58 49 315 63 54 340 68 58 90 19 16 10 pF ns ns EI to EO ns EI to GS ns EI to A0 - A2 ns 0 - 7 to GS ns 0 - 7 to EO Unit ns Test Conditions 0 - 7 to A 0 - A2 VCC (V) Min Typ Max Min 2.0 4.5 6.0 — — — — — — — — — — — — — — — — — — — — — — — 15 — — 16 — — 18 — — 12 — — 12 — — 12 — — 5 — 5 230 — 46 39 — — Propagation delay t PLH time t PHL t PLH t PHL 2.0 4.5 6.0 250 — 50 43 — — t PLH t PHL 2.0 4.5 6.0 270 — 54 46 — — t PLH t PHL 2.0 4.5 6.0 230 — 46 39 — — t PLH t PHL 2.0 4.5 6.0 250 — 50 43 — — t PLH t PHL 2.0 4.5 6.0 270 — 54 46 75 15 13 10 — — — — — — Output rise/fall time t TLH t THL 2.0 4.5 6.0 Input capacitance Cin — 4 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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Ltd. 16 Collyer Quay #20-00 Hitachi Tower Singapore 049318 Tel: 535-2100 Fax: 535-1533 Hitachi Asia Ltd. Taipei Branch Office 3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105) Tel: (2) 2718-3666 Fax: (2) 2718-8180 Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road, Tsim Sha Tsui, Kowloon, Hong Kong Tel: (2) 735 9218 Fax: (2) 730 0281 Telex: 40815 HITEC HX Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.