All other trademarks mentioned herein are property of their respective companies. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. 27C256 – /TS Package: Temperature Range: Access Time: Device DS11001N-page Plastic Leaded Chip Carrier P = Plastic DIP (Mil 600 Plastic SOIC (Mil 300) Blank = 0°. Product Identification System To order or to obtain information (e.g., on pricing or delivery), please use listed part numbers, and refer to factory or listed sales offices. All Yes bytes Device = original Passed data? 27C256 s pulse Pass Yes Device Failed Yes No Device Failed DS11001N-page 7. Program one 100 Increment X Verify Byte Fail Last Address? No Increment Address 4.5V, 5. 1.4 Output Enable This feature eliminates bus contention in multiple bus microprocessor systems and the outputs high impedance when the following condition is true: When these conditions are met, the supply current will drop from 100 A. Standby Mode The standby mode is defined when the CE pin is high (VIH) and a program mode is not defined.
Signstek eeprom programmer compadible 27c256 code#
For Read operations, if the addresses are stable, the address access time ( output (t after a delay from the falling edge 27C256 Verify t AH Data Out Valid OUT OUT X High Z X High Z X High Z Identity Code equal to the delay from ACC ). TABLE 1-4: PROGRAMMING DC CHARACTERISTICS Parameter Status Input Voltages Logic”1” Logic”0” Input Leakage - Output Voltages Logic”1” Logic”0” V Current, program & verify - Current, program - Product Identification - Note 1: V must be applied simultaneously or before V. TABLE 1-3: READ OPERATION AC CHARACTERISTICS AC Testing Waveform: Output Load: Input Rise and Fall Times Ambient Temperature: 27C256-90* 27C256-10* 27C256-12 27C256-15 27C256-20 Parameter Sym Min Max Address to Output t - 90 ACC Delay CE to Output Delay t - Output Delay t - O OFF High Impedance Output Hold from. 65☌ to +125☌ *Notice: Stresses above those listed under “. ELECTRICAL CHARACTERISTICS 1.1 Maximum Ratings* V and input voltages w.r.t. Accessing individual bytes from an address transition or from power-up (chip enable pin going low) is accomplished in less than 90 ns. The device is organized as 32K words by 8 bits (32K bytes). 27C256 is a CMOS 256K bit electrically Programmable Read Only Memory (EPROM). Automotive: -40☌ to +125☌ DESCRIPTION The Microchip Technology Inc. We have an Andromeda Labs PROM burner, which supports lots of devices.Īdded detail: I've been using the 28-pin DIP package.
(All of the EPROMs have seemed pretty good for this.) Would the 28C family be a good place to look? Robustness to student wiring mistakes would be great.
I'd be happy with as few as 8 address bits (we use two LS163s for the PC), although I doubt anyone makes something that small. It doesn't need to be pin-compatible, although that would be nice. These three are all 27C256 eproms, made by different manufacturers in different years (1984, 1989 week week 21). I started with the 27C256 EPROM but switched to the 29C256 EEPROM, which has now gotten hard to find.Ĭan anyone recommend an EEPROM (I'm sick of UV erasers) that would be a good replacement? Specifically, it should be reasonably priced, reliable, easily available and likely to remain so. Top row: D27C256-250V10, 27C256-15, 27C256-20. It requires only one 5V power supply in normal read mode operation. The instructions are read by a low-speed TTL computer they build. The AT27C256R is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM) organized 32K by 8 bits. I teach a hands-on computer architecture course in which the students burn their programs onto an EPROM with a commerical PROM burner.
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