Features True Dual-Ported memory cells which allow simultaneous reads of the same memory location High-speed access IDT70T35/34L (IDT70T25/24L) - Commercial: 20/25ns (max.) - Industrial: 25ns (max.) Low-power operation - IDT70T35/34L (IDT70T25/24L) Active: 200m W (typ.) Standby: 600aW (typ.) Separate upper-byte and lower-byte control for multiplexed bus compatibility IDT70T35/34L (IDT70T25/24L) easily expands data bus
| Symbol | Rating | Commercial & Industrial | Unit |
| yTERM(2) (VDD) | VDO Terminal Voltage with Respect to GND | -0.5 to+ 4.6 | V |
| TB ~S{3) | Temperature Under Bias | -55 to +125 | c |
| FSTG | Storage Temperature | -65 to +150 | c |
| TJN | Junction Temperature | +150 | c |
| IOUT(For VODO = 3.3V) | DC Output Current | 50 | mA |
| IOUT(For VDDO = 2.5V) | DC Output Current | 40 | mA |
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The demodulator will not be able to decode data when Af(Hz) = Af(ppm) x fRF is larger than the FSK frequency deviation. For small frequency deviations, the crystal should be pre-aged, and should have a small temperature coeffi- cient. The circuit has been tested with a 10MHz crystal, but other crystal frequencies can be used as well. The circuit has been tested with a 10MHz crystal, but other crystal frequencies can be used as well. Prestart of XCO The start-up time of a crystal oscillator is typically some milliseconds. Therefore, to save current consumption, the MICRF501 circuit has been designed so that the XCO is turned on before any other circuit block. During start-up the XCO amplitude will eventually reach a sufficient level to trigger the M-counter. After counting two M-counter output pulses the rest of the circuit will be turned on. The current consumption during the prestart period is approximately 300hcA. Lock Detector
