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PD243X 数据表(PDF) 6 Page - OSRAM GmbH |
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PD243X 数据表(HTML) 6 Page - OSRAM GmbH |
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6 / 14 page ![]() PD243X, PD353X, PD443X 2006-01-23 6 Timing Characteristics—Data “Write” Cycle Notes: 1. Wait 1.0 µs between any Reads or Writes after writing a Control Word with a Clear (D7=1). Wait 1.0 µs between any Reads or Writes after Clearing a Control Word with a Clear (D7=0). All other Reads and Writes can be back to back. 2. All input voltages are V IL=0.8 V, VIH=2.0 V. Timing Characteristics—Data “Read” Cycle 3. These waveforms are not edge triggered. 4. Data out voltages are measured with 100 pF on the data bus and the ability to source = –40 mA and sink=1.6 mA The rise and fall times are 60 ns. V OL=0.4 V, VOH=2.4 V. Switching Specifications (V CC=4.5 V) Write Cycle Timing Para- meter Description Specification Minimum –40°C 25°C 85°C Units T CLR (1) Clear RAM 1.0 1.0 1.0 µs T CLRD (1) Clear RAM Disable 1.0 1.0 1.0 µs T AS Address Setup 10 10 10 ns T CES Chip Enable Setup 0 0 0 ns T RS Read Enable Setup 10 10 10 ns T DS Data Setup 20 30 50 ns T W Write Pulse 60 70 90 ns T AH Address Hold 20 30 40 ns T DH Data Hold 20 30 40 ns T CEH Chip Enable Hold 0 0 0 ns T RH Read Enable Hold 20 30 40 ns T ACC Total Access Time = Setup Time + Write Time + Hold Time 90 110 140 ns TDS TDH TW TACC TAH TAS TCEH TCES 2.0 V 0.8 V CE0, CE1 A0, A1 RD 2.0 V 0.8 V 2.0 V 0.8 V 2.0 V 0.8 V D0–D6 2.0 V 0.8 V TRS TRH WR * * * * * Switching Specifications (V CC=4.5 V) Read Cycle Timing Para- meter Description Specification Minimum –40°C 25°C 85°C Units T AS Address Setup 0 0 0 ns T CES Chip Enable 0 0 0 ns T WS Write Enable Setup 20 30 40 ns T DD Data Delay Time 100 150 175 ns T R Read Pulse 150 175 200 ns T AH Address Hold 0 0 0 ns T DH Data Hold 0 0 0 ns T TRI Time to Tristate (Max. time) 30 40 50 ns T CEH Chip Enable Hold 0 0 0 ns T WH Write Enable Hold 30 40 50 ns T ACC Total Access Time = Setup Time + Read Time + Time to Tristate 200 245 290 ns T WAIT (1) Wait Time between Reads 0 0 0 ns TDD TR TAH TAS TCEH TCES 2.0 V 0.8 V CE0, CE1 A0–A3 TRACC 2.0 V 0.8 V 2.0 V 0.8 V 2.0 V 0.8 V D0–D6 2.0 V 0.8 V TWS TWH WR RD TDH TRI * * * * DATA OUT * |
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