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MX27C4000AQI-10 Datasheet(PDF) 2 Page - Macronix International |
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MX27C4000AQI-10 Datasheet(HTML) 2 Page - Macronix International |
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2 / 15 page  2 MX27C4000A REV. 1.6, JUL. 19, 2001 P/N: PM00694 FUNCTIONAL DESCRIPTION THE PROGRAMMING OF THE MX27C4000A When the MX27C4000A is delivered, or it is erased, the chip has all 4M bits in the "ONE" or HIGH state. "ZEROs" are loaded into the MX27C4000A 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 OTP ROM, a 01uF capacitor is required across Vpp and ground to suppress spurious voltage transients which may damage the device. FAST PROGRAMMING The device is set up in the fast programming mode when the programming voltage VPP = 12.75V is applied, with VCC = 6.25 V and OE = VIH (Algorithm is shown in Figure 1). The programming is achieved by applying a single TTL low level 10us 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 = VPP = 5V ± 10%. PROGRAM INHIBIT MODE Programming of multiple MX27C4000As in parallel with different data is also easily accomplished by using the Program Inhibit Mode. Except for CE and OE, all like inputs of the parallel MX27C4000A may be common. A TTL low-level program pulse applied to an MX27C4000A CE input with VPP = 12.5 ± 0.5 V and CE LOW will program that MX27C4000A. A high-level CE input inhibits the other MX27C4000As from being programmed. PROGRAM VERIFY MODE Verification should be performed on the programmed bits to determine that they were correctly programmed. The verification should be performed with OE and CE at VIL, and VPP at its programming voltage. AUTO IDENTIFY MODE The auto identify mode allows the reading out of a binary code from an OTP ROM 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 MX27C4000A. 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 MX27C4000A, 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. READ MODE The MX27C4000A has two control functions, both of which must be logically satisfied in order to obtain data CONTROL LOGIC OUTPUT BUFFERS Q0~Q7 CE OE A0~A18 ADDRESS INPUTS Y-DECODER X-DECODER Y-SELECT 4M BIT CELL MAXTRIX VCC VSS . . . . . . . . . . . . . . . . BLOCK DIAGRAM |
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