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| ********** C-MOS 4M (262,144x16) BIT DYNAMIC RAM - TOP VIEW 16 17 18 19 22 23 24 25 26 UPD424260LE-70(1/2) IL08 1 VDD (+5V) I/O1 IN/OUT 2 I/O2 IN/OUT 3 I/O3 IN/OUT 4 I/O4 IN/OUT 5 6 V DD (+5V) I/O5 IN/OUT 7 I/O6 IN/OUT 8 I/O7 IN/OUT 9 I/O8 IN/OUT 10 11 NC 12 NC WE IN 13 RAS IN 14 15 NC A0 IN 16 A1 IN 17 A2 IN 18 A3 IN 19 GND 40 39 I/O16 IN/OUT 38 I/O15 IN/OUT 37 I/O14 IN/OUT 36 I/O13 IN/OUT GND 35 34 I/O12 IN/OUT 33 I/O11 IN/OUT 32 I/O10 IN/OUT 31 I/O9 IN/OUT NC 30 29 LCAS 28 UCAS 27 OE IN IN IN A0 A1 A2 A3 A4 A5 A6 A7 A8 14 28 29 13 27 RAS UCAS LCAS WE OE I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 I/O8 I/O9 I/O10 I/O11 I/O12 I/O13 I/O14 I/O15 I/O16 2 3 4 5 7 8 9 10 31 32 33 34 36 37 38 39 26 A8 IN 25 A7 IN 24 A6 IN 22 A4 IN GND 21 w V CC 20 w w .D at aS A0-8 I/O1-16 RAS UCAS LCAS WE OE ; ADDRESS INPUTS ; DATA INPUTS/OUTPUTS ; ROW ADDRESS STROBE INPUT ; COLUMN ADDRESS STROBE (UPPER) INPUT ; COLUMN ADDRESS STROBE (LOWER) INPUT ; WRITE ENABLE INPUT ; OUTPUT ENABLE INPUT he et 4U .c om www..com 23 A5 IN UPD424260LE-70(2/2) 14 RAS 29 LCAS 28 UCAS 13 WE LOWER BYTE CONTROL 27 OE CLOCK GENERATOR CAS BEFORE RAS COUNTER ROW DECODER UPPER BYTE CONTROL DATA OUTPUT BUFFER 2-5,7-10 I/O1 I/O8 (LOWER BYTE) 16-19, 22-26 A0 A8 ROW ADDRESS BUFFER COLUMN ADDRESS BUFFER MEMORY CELL ARRAY 512x512x16 512x16 SENSE AMPLIFIER 512 COLUMN DECODER x16 X0-X8 512 DATA INPUT BUFFER DATA OUTPUT BUFFER 31-34,36-39 I/O9 I/O16 (UPPER BYTE) Y0-Y8 DATA INPUT BUFFER |
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