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TMS44C251ASD80 Datasheet

SYMBOL PIN I/O FUNCTION
REFO /FS4& 56 I/O 14.318MHz reference clock. This REF output is the stronger buffer for ISA bus loads. Latched input for FS4 at initial power up for H/W selecting the output frequency of CPU, SDRAM and PCI clocks (Default=0).


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Output voltage VREF9 8.937 9 0 9 063 v Fig.10
Max. output current lrmax9 10 mA Fig.10
Output voltage thermal characteristics TREF9 ±0.1 ±0.3 % Guaranteed design parameter at Ta = 25~OoC, 25~750C Fig.10
Thermal shutdown Tdow 100 deg Guaranteed design parameter Fig.10


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Ga Ga n(dB)@Vcc=3 0Volts n(dB)@Vcc=3 3Volts
+Gain(dB)@Vcc=5 0 Volts


Timer 2 is a 16 bit timer/counter like Timers o and l, it can operate either as a timer or as an event counter. This is selected by bit C/T2 in the Special Function Register T2CON (Figure l). It has three operating modes "capture", "autoload" and "baud rate generator", which are selected by bits in T2CON as shown in Table 2.