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2 / 12 page Philips Semiconductors Product specification 74ABT16823A 74ABTH16823A 18-bit bus-interface D-type flip-flop with reset and enable (3-State) 2 1998 Feb 27 853-1791 19025 FEATURES • Two sets of high speed parallel registers with positive edge-triggered D-type flip-flops • Ideal where high speed, light loading, or increased fan-in are required with MOS microprocessors • Live insertion/extraction permitted • Power-up 3-State • 74ABTH16823A incorporates bus-hold data inputs which eliminate the need for external pull-up resistors to hold unused inputs • Power-up Reset • Output capability: +64mA/–32mA • Latch-up protection exceeds 500mA per Jedec Std 17 • ESD protection exceeds 2000 V per MIL STD 883 Method 3015 and 200 V per Machine Model DESCRIPTION The 74ABT16823A 18-bit bus interface register is designed to eliminate the extra packages required to buffer existing registers and provide extra data width for wider data/address paths of buses carrying parity. The 74ABT16823A has two 9-bit wide buffered registers with Clock Enable (nCE) and Master Reset (nMR) which are ideal for parity bus interfacing in high microprogrammed systems. The registers are fully edge-triggered. The state of each D input, one set-up time before the Low-to-High clock transition is transferred to the corresponding flip-flop’s Q output. Two options are available, 74ABT16823A which does not have the bus-hold feature and 74ABTH16823A which incorporates the bus-hold feature. QUICK REFERENCE DATA SYMBOL PARAMETER CONDITIONS Tamb = 25°C; GND = 0V TYPICAL UNIT tPLH tPHL Propagation delay nCP to nQx CL = 50pF; VCC = 5V 2.3 1.9 ns CIN Input capacitance VI = 0V or VCC 4 pF COUT Output capacitance VO = 0V or VCC; 3-State 6 pF ICCZ Quiescent supply current Outputs disabled; VCC = 5.5V 500 µA ICCL Quiescent su ly current Outputs low; VCC = 5.5V 9 mA ORDERING INFORMATION PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER 56-Pin Plastic SSOP Type III –40 °C to +85°C 74ABT16823A DL BT16823A DL SOT371-1 56-Pin Plastic TSSOP Type II –40 °C to +85°C 74ABT16823A DGG BT16823A DGG SOT364-1 56-Pin Plastic SSOP Type III –40 °C to +85°C 74ABTH16823A DL BH16823A DL SOT371-1 56-Pin Plastic TSSOP Type II –40 °C to +85°C 74ABTH16823A DGG BH16823A DGG SOT364-1 PIN DESCRIPTION PIN NUMBER SYMBOL FUNCTION 2, 27 1OE, 2OE Output enable input (active-Low) 54, 52, 51, 49, 48, 47, 45, 44, 43 42, 41, 40, 38, 37, 36, 34, 33, 31 1D0-1D8 2D0-2D8 Data inputs 3, 5, 6, 8, 9, 10, 12, 13, 14 15, 16, 17, 19, 20, 21, 23, 24, 26 1Q0-1Q8 2Q0-2Q8 Data outputs 56, 29 1CP, 2CP Clock pulse input (active rising edge) 55, 30 1CE, 2CE Clock enable input (active-Low) 1, 28 1MR, 2MR Master reset input (active-Low) 4, 11, 18, 25, 32, 39, 46, 53 GND Ground (0V) 7, 22, 35, 50 VCC Positive supply voltage |
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