Features Fast read access time 90ns Dual voltage range operation Unregulated battery power supply range, 2.7V to 3.6V, or Standard power supply range, 5V 10% Pin compatible with JEDEC standard Atmel AT27C1024 Low-power CMOS operation 20A max standby (less than 1A, typical) for V = 3.6V CC 36mW max active at 5MHz for V = 3.6V CC 1Mb (64K x 16) JEDEC standard surface mount package Unregulated 44-lead PLCC High-reliability CMOS technology Battery Voltage, 2,000V ESD protection High-speed, 200mA latchup immunity One-time Rapid programming algorithm 100s/word (typical) CMOS- and TTL-compatible inputs and outputs Programmable, JEDEC standard for LVTTL and LVBO Read-only Memory Integrated product identification code Industrial temperature range Atmel AT27BV1024 1. Description The Atmel AT27BV1024 is a high-performance, low-power, low-voltage, 1,048,576-bit, one-time programmable, read-only memory (OTP EPROM) organized as 64K by 16 bits. It requires only one supply in the range of 2.7V to 3.6V in normal read mode operation. The x16 organization makes this part ideal for portable and handheld 16- and 32-bit micropro- cessor-based systems using either regulated or unregulated battery power. The Atmel innovative design techniques provide fast speeds that rival 5V parts, while keep- ing the low power consumption of a 3V supply. At V = 2.7V, any word can be accessed in CC less than 90ns. With a typical power dissipation of only 18mW at 5MHz and V = 3V, the CC AT27BV1024 consumes less than one-fifth the power of a standard, 5V EPROM. Standby mode supply current is typically less than 1A at 3V. The AT27BV1024 simplifies system design and stretches battery lifetime even further by eliminating the need for power supply regulation. The AT27BV1024 is available in an industry-standard, JEDEC-approved, one-time pro- grammable (OTP) PLCC package. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention. The AT27BV1024 operating with V at 3.0V produces TTL-level outputs that are compati- CC ble with standard TTL logic devices operating at V = 5.0V. At V = 2.7V, the part is CC CC compatible with JEDEC-approved, low-voltage battery operation (LVBO) interface specifi- cations. The device is also capable of standard, 5V operation making it ideally suited for dual supply range systems or card products that are pluggable in both 3V and 5V hosts. The AT27BV1024 has additional features to ensure high quality and efficient production use. The rapid programming algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 s/word. 0631FEPROM4/11 The integrated product identification code electronically identifies the device and manufacturer. This feature is used by industry-standard programming equipment to select the proper programming algorithms and voltages. The AT27BV1024 programs in exactly the same way as a standard, 5V Atmel AT27C1024, and uses the same programming equipment. 2. Pin configurations 44-lead PLCC Pin Name Function Top view A0 - A15 Addresses O0 - O15 Outputs O12 7 39 A13 CE Chip enable O11 8 38 A12 O10 9 37 A11 OE Output enable O9 10 36 A10 O8 11 35 A9 PGM Program strobe GND 12 34 GND NC 13 33 NC NC No connect O7 14 32 A8 Note: Both GND pins must be connected. O6 15 31 A7 O5 16 30 A6 O4 17 29 A5 Note: PLCC Package Pins 1 and 23 are dont connect. 3. System considerations Switching between active and standby conditions via the chip enable pin may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed datasheet limits, resulting in device non-conformance. At a minimum, a 0.1F, high-frequency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the V and ground terminals of the device, as close to the device as possible. CC Additionally, to stabilize the supply voltage level on printed circuit boards with large EPROM arrays, a 4.7F bulk electrolytic capacitor should be utilized, again connected between the V and ground terminals. This capacitor should be positioned as CC close as possible to the point where the power supply is connected to the array. Figure 3-1. Block diagram 2 Atmel AT27BV1024 0631FEPROM4/11 O3 18 6 O13 O2 19 5 O14 O1 20 4 O15 O0 21 3 CE OE 22 2 VPP NC 23 1 NC A0 24 44 VCC A1 25 43 PGM A2 26 42 NC A3 27 41 A15 A4 28 40 A14