米6体育平台手机版

ZHCSQ80D November 1998 – March 2022 CD54HC251 , CD54HCT251 , CD74HC251 , CD74HCT251

PRODUCTION DATA

请参考 PDF 数据表获取器件具体的封装图。

5.5 Switching Characteristics

Input t_t = 6ns. Unless otherwise specified, C_L = 50pF

PARAMETER		V_CC (V)	25°C		-40°C to 85°C	-55°C to 125°C	UNIT
PARAMETER		V_CC (V)	TYP	MAX	MAX	MAX	UNIT
HC TYPES
t_pd	Select to outputs	2		245	305	370	ns
		4.5	21⁽¹⁾	49	61	74
		6		42	52	63
t_pd	Data to outputs	2		175	220	265	ns
		4.5	12⁽¹⁾	35	44	53
		6		30	37	45
t_pd	Enable to high Z and enable from high Z	2		140	175	210	ns
		4.5	11⁽¹⁾	28	35	42
		6		24	30	36
t_t	Output transition times	2		75	95	110	ns
		4.5		15	19	22
		6		13	16	19
C_i	Input capacitance			10	10	10	pF
C_O	Three-state output capacitance			15	15	15	pF
C_pd⁽³⁾⁽⁴⁾	Power dissipation capacitance	5	60⁽²⁾				pF
HCT TYPES
t_pd	Select to outputs	4.5	18⁽¹⁾	42	53	63	ns
t_pd	Data to outputs	4.5	12⁽¹⁾	35	44	53	ns
t_pd	Enable to high Z and enable from high Z	4.5	12⁽¹⁾	30	38	45	ns
t_t	Output transition times	4.5		15	19	22	ns
C_i	Input capacitance			10	10	10	pF
C_pd⁽³⁾⁽⁴⁾	Power dissipation capacitance	5	60⁽²⁾				pF

(1) Typical value tested at 5V, C_L = 15pF.

(2) Typical value tested at 5V.

(3) C_PD is used to determine the dynamic power consumption, per channel.

(4) P_D = V_CC²f_i(C_PD + C_L) where f_i = input frequency, C_L = output load capacitance, V_CC = supply voltage.