MC10E143, MC100E143 5V ECL 9-Bit Hold Register Description The MC10E/100E143 is a 9-bit holding register, designed with byte-parity applications in mind. The E143 holds current data or loads new data, with the nine inputs D0 D8 accepting parallel input data. MC10E143, MC100E143 SEL D D D D V Q 8 7 6 5 CCO 8 D Q 0 MUX 25 24 23 22 21 20 19 D 0 R MR 18 26 Q 7 Q D 1 CLK1 27 17 Q MUX 6 D R 1 CLK2 28 16 V CC D Q 2 MUX 1 V D EE 15 2 R Q Pinout: 28-Lead PLCC 5 (Top View) NC 2 14 V CCO Q D 3 MUX D R 3 D 3 13 0 Q 4 D 1 4 12 Q 3 56 7 8 9 10 11 D D D V Q Q Q Q 2 3 4 CCO 0 1 2 D 8 MUX R D 8 * All V and V pins are tied together on the die. CC CCO Warning: All V , V , and V pins must be externally CC CCO EE SEL connected to Power Supply to guarantee proper operation. CLK1 CLK2 Figure 1. 28Lead Pinout MR Figure 2. Logic Diagram Table 1. PIN DESCRIPTION PIN FUNCTION D D ECL Parallel Data Inputs 0 8 SEL ECL Mode Select Input CLK1, CLK2 ECL Clock Inputs MR ECL Master Reset Q Q ECL Data Outputs 0 8 NC No Connect V , V Positive Supply* CC CCO V Negative Supply EE *From V pin to each V pin is an internal 100 resistor. CC CCO Table 2. FUNCTIONS SEL Mode L Load H Hold