Replaceable Parts 4-7
** Order present firmware revision level
.
U117 IC, QUAD D FLIP FLOP W/CLK, RESET
74HC175
IC-923
U118 IC, NCHAN LAT DMOS QUADFET,
SD5400CY
IC-893
U119,U125 IC, QUAD 2 IN NOR, 74HCT02 IC-809
U120 IC, QUAD 2-INPUT NAND, 74HC00M IC-781
U121 SILICON-GATE CMOS IC-1123
U122,U142,U133 IC, DUAL HIGH CMR/SPEED OPTO,
HCPL-2631
IC-588
U123 PROGRAMMED ROM 2303-803A**
U124 LARGE SCALE IC LSI-162-70
U127 IC, MOT MC68331CPV16 LSI-188
U129 INTEGRATED CIRCUIT, OPA177GS IC-960
U130 DUAL DECADE RIPPLE COUNTER IC-1131
U131 IC, OCTAL INTERFACE BUS, 75160 IC-646
U132 IC, DUAL BIPOLAR OP-AMP, LT1124CS8 IC-955
U134 PRECISION BIFET OPAMP IC-1194
U135 IC, OP-AMP, NE5534D IC-802
U136 PROGRAMMED ROM 2000-802**
U137 IC, GPIB ADAPTER, 9914A (PLCC) LSI-123
U138 QUAD SPST ANALOG SWITCH IC-1211
U140,U148,U139 IC, POS NAND GATES/INVERT, 74HCT14 IC-656
U141 IC, OCTAL INTER BUS TRANS, 75161 IC-647
U145 IC, SERIAL EPROM 24LC16B LSI-153
U147 IC, DUAL D-TYPE F/F, 74HC74 IC-773
U154 CMOS ANALOG SWITCH IC-1210
VR100,VR102 DIODE, ZENER, 6.2V, MMSZ6V2 DZ-97
VR101 DIODE, ZENER 6.44V, IN4577AGED DZ-58
Y100 OSCILLATOR HIGH SPEED CMOS
12MHZ
CR-37
Y101 CRYSTAL, FSM327 CR-41
Table 4-1 (continued)
Models 2303 and 2303-PJ digital board parts list
Circuit designation Description Keithley part no.
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