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AT68166FT-YS18-SCC Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT68166FT-YS18-SCC Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 19 page 8 7531H–AERO–04/09 AT68166FT Consumption Notes: 1. All CSx >V IH 2. All CSx > V CC - 0.3V 3. F = 1/TAVAV, Iout = 0 mA, WEx = OE = VIH, VIN = GND/VCC, VCC max. 4. F = 1/TAVAW, Iout = 0 mA, WEx = VIL, OE = VIH , VIN = GND/VCC, VCC max. Data Retention Mode Atmel CMOS RAM's are designed with battery backup in mind. Data retention voltage and sup- ply current are guaranteed over temperature. The following rules insure data retention: 1. During data retention chip select CSx must be held high within VCC to VCC -0.2V. 2. Output Enable (OE) should be held high to keep the RAM outputs high impedance, mini- mizing power dissipation. 3. During power-up and power-down transitions CSx and OE must be kept between VCC + 0.3V and 70% of VCC. 4. The RAM can begin operation > tR ns after VCC reaches the minimum operation voltages (3V). Figure 5. Data Retention Timing Symbol Description TAVAV/TAVAW Test Condition AT68166FT-25 AT68166FT-20 AT68166FT-18 (preliminary) Unit Value ICCSB(1) Standby Supply Current – 10 7 7.5 mA max ICCSB1(2) Standby Supply Current –8 6 7 mA max ICCOP(3) Read per byte Dynamic Operating Current 18 ns 20 ns 25 ns 50 ns 1 µs – – 150 85 15 – 165 145 80 12 170 165 145 80 12 mA max ICCOP(4) Write per byte Dynamic Operating Current 18 ns 20 ns 25 ns 50 ns 1 µs – – 150 125 110 – 140 135 115 105 145 140 135 115 105 mA max vcc CSx |
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