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ZHCSPL9A January 2024 – August 2024 THVD2419 , THVD2429

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8.4 Device Functional Modes

When the driver enable pin, DE, is logic high, the differential outputs A and B follow the logic states at data input D. A logic high at D causes A to turn high and B to turn low. The differential output voltage defined as V_OD = V_A – V_B is positive. When D is low, the output states reverse: B turns high, A becomes low, and V_OD is negative.

When DE is low, both outputs turn high-impedance. In this condition the logic state at D is irrelevant. The DE pin has an internal pull-down resistor to ground. When left open the driver is disabled (high-impedance) by default. The D pin has an internal pull-up resistor to V_CC; thus, when left open while the driver is enabled, output A turns high and B turns low.

Table 8-1 Driver Function Table

INPUT	ENABLE	OUTPUTS		FUNCTION
D	DE	A	B	FUNCTION
H	H	H	L	Actively drive bus high
L	H	L	H	Actively drive bus low
X	L	Z	Z	Driver disabled
X	OPEN	Z	Z	Driver disabled by default
OPEN	H	H	L	Actively drive bus high by default

When the receiver enable pin, RE, is logic low, the receiver is enabled. When the differential input voltage defined as V_ID = V_A – V_B is higher than the positive input threshold, V_TH+, the receiver output, R, turns high. When V_ID is lower than the negative input threshold, V_TH-, the receiver output, R, turns low. If V_ID is between V_TH+ and V_TH- the output is indeterminate.

When RE is logic high or left open, the receiver output is high-impedance and the magnitude and polarity of V_ID are irrelevant. Internal biasing of the receiver inputs causes the output to go failsafe-high when the transceiver is disconnected from the bus (open-circuit), the bus lines are shorted to one another (short-circuit), or the bus is not actively driven (idle bus).

Table 8-2 Receiver Function Table

DIFFERENTIAL INPUT	ENABLE	OUTPUT	FUNCTION
V_ID = V_A – V_B	RE	R	FUNCTION
V_TH+ < V_ID	L	H	Receive valid bus high
V_TH- < V_ID < V_TH+	L	Indeterminate	Indeterminate bus state
V_ID < V_TH-	L	L	Receive valid bus low
X	H	Z	Receiver disabled
X	OPEN	Z	Receiver disabled by default
Open-circuit bus	L	H	Fail-safe high output
Short-circuit bus	L	H	Fail-safe high output
Idle (terminated) bus	L	H	Fail-safe high output

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機械數據 (封裝 | 引腳)

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訂購信息

8.4 Device Functional Modes