Document
MX27C8000
8M-BIT [1M x8] CMOS EPROM
FEATURES
• • • • • •
1M x 8 organization Single +5V power supply +12.5V programming voltage Fast access time: 100/120/150 ns Totally static operation Completely TTL compatible
• Operating current: 60mA • Standby current: 100uA • Package type:
- 32 pin plastic DIP - 32 pin PLCC/SOP - 32 pin TSOP
GENERAL DESCRIPTION
The MX27C8000 is a 5V only, 8M-bit, One Time Programmable Read Only Memory. It is organized as 1M words by 8 bits per word, operates from a single +5 volt supply, has a static standby mode, and features fast single address location programming. All programming signals are TTL levels, requiring a single pulse. For programming outside from the system, existing EPROM programmers may be used. The MX27C8000 supports a intelligent fast programming algorithm which can result in programming time of less than two minutes. This EPROM is packaged in industry standard 32 pin dual-in-line packages, 32 lead PLCC, 32 lead TSOP and 32 lead SOP packages.
PIN CONFIGURATIONS
32 PDIP/SOP
A19 A16 A15 A12 A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 VCC A18 A17 A14 A13 A8 A9 A11 OE/VPP A10 CE Q7 Q6 Q5 Q4 Q3
32 PLCC
VCC A12 A15 A16 A19 A18 A17
32 TSOP
A11 A9 A8 A14 A13 A13 A14 A17 A8 A18 A9 VCC A19 A11 A16 OE/VPP A15 A10 A12 A7 CE A6 Q7 A5 A4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 OE/VPP A10 CE Q7 Q6 Q5 Q4 Q3 GND Q2 Q1 Q0 A0 A1 A2 A3
A7 A6 A5 A4 A3 A2 A1 A0 Q0
5
4
1
32
30 29
MX27C8000
9
MX27C8000
25
MX27C8000
13 14
Q1 Q2 GND
17
Q3 Q4 Q5
21 20
Q6
BLOCK DIAGRAM
CE OE/VPP CONTROL LOGIC OUTPUT BUFFERS Q0~Q7
PIN DESCRIPTION
SYMBOL A0~A19 Q0~Q7 PIN NAME Address Input Data Input/Output Chip Enable Input Output Enable Input/Program Supply Voltage Power Supply Pin (+5V) Ground Pin
A0~A19 ADDRESS INPUTS
. . . . . . . .
Y-DECODER
. . . . . . . .
Y-SELECT
CE OE/VPP
X-DECODER
8M BIT CELL MAXTRIX
VCC GND
VCC GND
P/N: PM00259
1
REV. 3.5, AUG. 20, 2001
MX27C8000
FUNCTIONAL DESCRIPTION
THE PROGRAMMING OF THE MX27C8000 When the MX27C8000 is delivered, or it is erased, the chip has all 8M bits in the "ONE" or HIGH state. "ZEROs" are loaded into the MX27C8000 through the procedure of programming. For programming, the data to be programmed is applied with 8 bits in parallel to the data pins. Vcc must be applied simultaneously or before Vpp, and removed simultaneously or after Vpp. When programming an MXIC EPROM, a 0.1uF capacitor is required across Vpp and ground to suppress spurious voltage transients which may damage the device. AUTO IDENTIFY MODE The auto identify mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and device type. This mode is intended for use by programming equipment for the purpose of automatically matching the device to be programmed with its corresponding programming algorithm. This mode is functional in the 25° C ± 5° C ambient temperature range that is required when programming the MX27C8000. To activate this mode, the programming equipment must force 12.0 ± 0.5 V on address line A9 of the device. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH. All other address lines must be held at VIL during auto identify mode. Byte 0 ( A0 = VIL) represents the manufacturer code, and byte 1 (A0 = VIH), the device identifier code. For the MX27C8000, these two identifier bytes are given in the Mode Select Table. All identifiers for manufacturer and device codes will possess odd parity, with the MSB (Q7) defined as the parity bit.
FAST PROGRAMMING The device is set up in the fast programming mode when the programming voltage OE/VPP = 12.75V is applied, with VCC = 6.25 V (Algorithm is shown in Figure 1). The programming is achieved by applying a single TTL low level 50us pulse to the CE input after addresses and data line are stable. If the data is not verified, an additional pulse is applied for a maximum of 25 pulses. This process is repeated while sequencing through each address of the device. When the programming mode is completed, the data in all address is verified at VCC = 5V ± 10%.
READ MODE The MX27C8000 has two control functions, both of which must be logically satisfied in order to obtain data at the outputs. Chip Enable (CE) is the power control and should be used for device selection. Output Enable (OE) is the output control and should be used to gate data to the output pins, independent of device selection. Assuming that addresses are stable, address access time (tACC) is equal to the delay from CE to output (tCE). Data is available at the outputs tOE after the falling edge of OE's, assuming that CE has been LOW and addresses have been stable for at least tACC - tOE.
PROGRAM INHIBIT MODE Programming of multiple MX27C8000s in parallel with different data is also easily accomplished by using the Program Inhibit Mode.