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74ABT16841 Datasheet(PDF) 2 Page - NXP Semiconductors |
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74ABT16841 Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 10 page Philips Semiconductors Product specification 74ABT16841A 74ABTH16841A 20-bit bus interface latch (3-State) 2 1998 Feb 27 853-1797 19025 FEATURES • High speed parallel latches • Live insertion/extraction permitted • Extra data width for wide address/data paths or buses carrying parity • Power-up 3-State • 74ABTH16841A incorporates bus-hold data inputs which eliminate the need for external pull-up resistors to hold unused inputs • Power-up reset • Ideal where high speed, light loading, or increased fan-in are required with MOS microprocessors • Output capability: +64mA/–32mA • Latch-up protection exceeds 500mA per Jedec Std 17 • ESD protection exceeds 2000V per MIL STD 883 Method 3015 and 200V per Machine Model DESCRIPTION The 74ABT16841A Bus interface latch is designed to provide extra data width for wider data/address paths of buses carrying parity. The 74ABT16841A consists of two sets of ten D-type latches with 3-State outputs. The flip-flops appear transparent to the data when Latch Enable (nLE) is High. This allows asynchronous operation, as the output transition follows the data in transition. On the nLE High-to-Low transition, the data that meets the setup and hold time is latched. Data appears on the bus when the Output Enable (nOE) is Low. When nOE is High the output is in the High-impedance state. Two options are available, 74ABT16841A which does not have the bus-hold feature and 74ABTH16841A which incorporates the bus-hold feature. QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS Tamb = 25°C; GND = 0V TYPICAL UNIT tPLH tPHL Propagation delay nDx to nQx CL = 50pF; VCC = 5V 3.1 2.2 ns CIN Input capacitance VI = 0V or VCC 4 pF COUT Output capacitance VO = 0V or VCC; 3-State 7 pF ICCZ Quiescent supply current Outputs disabled; VCC = 5.5V 500 µA ICCL Quiescent supply current Outputs LOW; VCC = 5.5V 10 mA ORDERING INFORMATION PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER 56-Pin Plastic SSOP Type III –40 °C to +85°C 74ABT16841A DL BT16841A DL SOT371-1 56-Pin Plastic TSSOP Type II –40 °C to +85°C 74ABT16841A DGG BT16841A DGG SOT364-1 56-Pin Plastic SSOP Type III –40 °C to +85°C 74ABTH16841A DL BH16841A DL SOT371-1 56-Pin Plastic TSSOP Type II –40 °C to +85°C 74ABTH16841A DGG BH16841A DGG SOT364-1 PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 55, 54, 52, 51, 49, 48, 47, 45, 44, 43 42, 41, 40, 38, 37, 36, 34, 33, 31, 30 1D0 – 1D9 2D0 – 2D9 Data inputs 2, 3, 5, 6, 8, 9, 10, 12, 13, 14 15, 16, 17, 19, 20, 21, 23, 24, 26, 27 1Q0 – 1Q9 2Q0 – 2Q9 Data outputs 1, 28 1OE, 2OE Output enable inputs (active-Low) 56, 29 1LE, 2LE Latch enable inputs (active rising edge) 4, 11, 18, 25, 32, 39, 46, 53 GND Ground (0V) 7, 22, 35, 50 VCC Positive supply voltage |
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