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N74F821D-T N74F821D-T N74F821DT Datasheet

l	Thermal Resistance Junction-case Max Thermal Resistance Junction-ambient Max	1 62.5	oC/w oC/w

N74F821D-T N74F821D-T N74F821DT Price

Chip select. When CSO and CSl are HIGH and ~S2 is LOW, these three inputs select the UART. When any of these inputs are inactive, the UART remains inactive (refer to AS description). Clear to send. CTS is a modem status signal. Its condition can be checked by reading bit 4 (CTS) of the modem status register. Bit 0 (CTS) of the modem status register indicates that CTS has changed states since the last read from the modem status register. If the modem status interrupt is enabled when CTS changes levels and the auto-CTS mode is not enabled, an interrupt is generated. This pin has no effect on the UART's transmit or receive operation.
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Parameter	Symbol	Condition	Min	Typ	Max	Units
OUTA, OUTB (Cont.)
Ripple Rejection	PSRR	f = 120Hz, CBYP = 10nF		60		dB
Output Voltage Noise	en	f = 10Hz t0 99kHz, IOUT = 50mA, CBYP = 10nF, Cour = 2.2pF		50		hiVRMS
BYP
Start-up Rise Time	tr	CBYP=10nF		1.5		ms
ENABLE (ENA, ENB)
Enable Input Threshold	VIH		1.6			V
Enable Input Threshold	VIL				0.4	V
Enable Input Current	IEN				0.2	IJA
RSTA, RSTB
Reset Threshold	VTH	VOUT falling	88	90	92	%VOUT
Reset Threshold	VTH	VOUT rising	90	92	94	%VOUT
Reset A Delay	tRSTA		30	50	70	ms
Reset B Delay	tRSTB	VDLYB=OV	90	1 50	210	ms
Reset A. B Output Voltage'''	VOH	ISOURCE = 0.5mA	80			%VOUT
Reset A. B Output Voltage'''	VOL	ISINK = 1.2mA			0.3	V
DLYB
Delay Voltage Threshold	VDLYB		1.225	1.250	1.275	V
Delay Source Current	IDLYB	VOUTB< VTH	2.1	3.0	3.9	UA
OVER TEMPERATURE PROTECTION
High Trip Level	TH,			1 50		IC
Hysteresis	THYST			20		][c

INVA INVB (Pins 4, 13): Inverting Input. ~ch of theINV pins is an inverting input of an op amp. Note that the INV pins are high impedance, sensitive nodes of the filter and very susceptible to coupling of unintended signals. Capacitance on the INV nodes will also affect the fre- quency response of thefilter sections. R)r these reasons, printed circuit connectionsto theINV pins must be kept as short as possible.

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