NAD T 743 Service Manual page 45

74HC251
DIGITAL BOARD: U1203
AT24C16
KEYBOARD: U210
16Kb
TCM810
KEYBOARD: U214
PIN7 STROBE
PIN4 D0
PIN3 D1
PIN2 D2
PIN1 D3
PIN15 D4
PIN14 D5
PIN13 D6
PIN12 D7
PIN11 A
PIN10 B
PIN9 C
/8Kb /4Kb /2Kb
NC / NC / NC / E0
NC / NC / E1 / E1
NC / E2 / E2 / E2
GND
RESET**(RESET)
NOTE: *3-Pin SOT-23B is equivalent to JEDEC TO-236
** () is for TCM810
S0
S0 S0
S1
S1
S1
S2
S2 S2
S3
S3 S3
S4
S4 S4
S5
S5
S5
S6
S6
S6
S7
S7 S7
M24Cxx
/1Kb
/ E0 1 8
/ E1 2 7
/ E2 3 6
V SS 4 5
*3-P in SOT-23B
1
V CC
3
TCM809 x ENB
TCM810 x ENB
2
45
W PIN6
Y PIN5
PIN8 GND
PIN16 VCC
V CC
WC
SCL
SDA