M28F420 4 mbit (512kb x8 or 256kb x16, boot block) flash memory 5v 10% supply voltage 12v 5% or 10% programming voltage fast access time: 60ns program/erase controller (p/e.c.) automatic static mode memory erase in blocks boot block (bottom location) with hardware write and erase protection parameter and main blocks 100,000 program/erase cycles low power consumption 20 years data retention defectivity below 1ppm/year electronic signature manufacturer code: 0020h device code: 00fah description the M28F420 flash memory is a non-volatile memorythat may be erased electricallyat the block level and programmed by byte or by word. b28f420/808 1/2 complete data available on data-on-disc cd-rom or at www.st.com a0-a16 address inputs dq0-dq7 data input / outputs dq8-dq14 data input / outputs dq15a1 data input/output or address input e chip enable g output enable w write enable byte byte/word organization wp write protect rp reset/power down/boot block unlock v pp program & erase supply voltage v cc supply voltage v ss ground signal names ai01130e 18 a0-a17 w dq0-dq14 v pp v cc M28F420 g e v ss 15 rp byte dq15a1 wp figure 1. logic diagram 44 1 so44 (m)
2/2 example: M28F420 -80 x n 1 tr operating voltage f5v array matrix 2 bottom boot speed -60 60ns -70 70ns -80 80ns -90 90ns -120 120ns power supplies blank v cc 10% v pp 5% xv cc 5% v pp 5% yv cc 10% v pp 10% package m so44 temp. range 1 0 to 70 c 6 40 to 85 c 3 40 to 125 c option tr tape & reel packing note: devices are shipped from the factory with the memory content erased (to ffh). ordering information scheme for a list of available options or for further informa- tion on any aspect of this device, please contact the stmicroelectronics sales office nearestto you. M28F420 g dq0 dq8 a3 a0 e v ss a2 a1 a13 v ss a14 a15 dq7 a12 a16 byte dq15a1 dq5 dq2 dq3 v cc dq11 dq4 dq14 a9 w a4 v pp rp a7 ai01133d M28F420 8 2 3 4 5 6 7 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 20 19 18 17 dq1 dq9 a6 a5 dq6 dq13 44 39 38 37 36 35 34 33 a11 a10 dq10 21 dq12 40 43 1 42 41 a17 a8 wp so pin connections
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