NXP 74HC244BQ, 74HC244D, 74HC244DB, 74HC244N, 74HC244PW Schematics

74HC244; 74HCT244

Octal buffer/line driver; 3-state

Rev. 4 — 24 September 2012 Product data sheet

1. General description

The 74HC244; 74HCT244 is an 8-bit buffer/line driver with 3-state outputs. The device can be used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.

2.Features and benefits

Input levels:

For 74HC244: CMOS level

For 74HCT244: TTL level

Octal bus interface

Non-inverting 3-state outputs

Complies with JEDEC standard no. 7 A

ESD protection:

HBM JESD22-A114F exceeds 2000 V

MM JESD22-A115-A exceeds 200 V

Multiple package options

Specified from 40 C to +85 C and 40 C to +125 C

3.Ordering information

Table 1. Ordering information

Type number	Package
	Temperature range	Name	Description	Version
74HC244N	40 C to +125 C	DIP20	plastic dual in-line package; 20 leads (300 mil)	SOT146-1
74HCT244N
74HC244D	40 C to +125 C	SO20	plastic small outline package; 20 leads;	SOT163-1
			body width 7.5 mm
74HCT244D
74HC244DB	40 C to +125 C	SSOP20	plastic shrink small outline package; 20 leads;	SOT339-1
			body width 5.3 mm
74HCT244DB
74HC244PW	40 C to +125 C	TSSOP20	plastic thin shrink small outline package; 20 leads;	SOT360-1
			body width 4.4 mm
74HCT244PW
74HC244BQ	40 C to +125 C	DHVQFN20	plastic dual-in-line compatible thermal enhanced	SOT764-1
			very thin quad flat package; no leads; 20 terminals;
74HCT244BQ
			body 2.5 4.5 0.85 mm

NXP Semiconductors	74HC244; 74HCT244
	Octal buffer/line driver; 3-state

4. Functional diagram

2		1A0									1Y0
													18
		1A1									1Y1
4
													16
		1A2									1Y2
6
													14
		1A3									1Y3
8
													12
1		1OE									2Y0
		2A0
17
													3
15		2A1									2Y1
													5
		2A2									2Y2
13
													7
		2A3									2Y3
11
													9
19		2OE
										mna875

Fig 1. Functional diagram

																									1
																												EN
					2							18					17						3
1A0													1Y0	2A0										2Y0			2					18
					4												15										4					16
1A1									16				1Y1	2A1							5			2Y1			6					14
																									8							12
					6												13
1A2									14				1Y2	2A2							7			2Y2
																									19
																												EN
					8												11
1A3												12	1Y3	2A3							9			2Y3
																											11					9
					1												19
																											13					7
1OE														2OE									mna874
																											15					5
																									17							3
																														mna873
Fig 2.						Logic symbol																			Fig 3. IEC logic symbol

74HC_HCT244

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2012. All rights reserved.

Product data sheet

Rev. 4 — 24 September 2012

2 of 18

NXP Semiconductors	74HC244; 74HCT244
	Octal buffer/line driver; 3-state

5.Pinning information

5.1Pinning

74HC244

74HCT244

			1		20
1OE						VCC
1A0			2		19	2OE
2Y0			3		18	1Y0
1A1			4		17	2A0
2Y1			5		16	1Y1
1A2			6		15	2A1
2Y2			7		14	1Y2
1A3			8		13	2A2
2Y3			9		12	1Y3
GND			10		11	2A3
				001aae011

Fig 4. Pin configuration DIP20, SO20, (T)SSOP20

74HC244

74HCT244

terminal 1			1OE	V
				CC
index area
		1		20
1A0	2				19	2OE
2Y0	3				18	1Y0
1A1	4				17	2A0
2Y1	5				16	1Y1
1A2	6				15	2A1
2Y2	7				14	1Y2
1A3	8	GND(1)			13	2A2
2Y3	9	10		11	12	1Y3
			GND	2A3		001aae012

Transparent top view

(1)This is not a supply pin. The substrate is attached to this pad using conductive die attach material. There is no electrical or mechanical requirement to solder this pad. However, if it is soldered, the solder land should remain floating or be connected to GND.

Fig 5. Pin configuration DHVQFN20

5.2					Pin description
Table 2. Pin description
Symbol					Pin	Description
					1, 19	output enable input (active LOW)
	1OE,	2OE
1A0, 1A1, 1A2, 1A3					2, 4, 6, 8	data input
2Y0, 2Y1, 2Y2, 2Y3					3, 5, 7, 9	bus output
GND					10	ground (0 V)
2A0, 2A1, 2A2, 2A3					17, 15, 13, 11	data input
1Y0, 1Y1, 1Y2, 1Y3					18, 16, 14, 12	bus output
VCC					20	supply voltage

74HC_HCT244

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2012. All rights reserved.

Product data sheet

Rev. 4 — 24 September 2012

3 of 18

NXP Semiconductors					74HC244; 74HCT244
						Octal buffer/line driver; 3-state
6. Functional description
Table 3.			Function table[1]
Input						Output
				nAn		nYn
nOE
L				L		L
L				H		H
H				X		Z

[1]H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.

7. Limiting values

Table 4. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol	Parameter	Conditions		Min	Max	Unit
VCC	supply voltage			0.5	+7	V
IIK	input clamping current	VI < 0.5 V or VI > VCC + 0.5 V		-	20	mA
IOK	output clamping current	VO < 0.5 V or VO > VCC + 0.5 V		-	20	mA
IO	output current	0.5 V < VO < VCC + 0.5 V		-	35	mA
ICC	supply current			-	70	mA
IGND	ground current			70	-	mA
Tstg	storage temperature			65	+150	C
Ptot	total power dissipation	DIP20 package	[1]	-	750	mW
		SO20, SSOP20, TSSOP20 and	[2]	-	500	mW
		DHVQFN20 packages

[1]For DIP20 package: Ptot derates linearly with 12 mW/K above 70 C.

[2]For SO20 packages: Ptot derates linearly with 8 mW/K above 70 C.

For SSOP20 and TSSOP20 packages: Ptot derates linearly with 5.5 mW/K above 60 C. For DHVQFN20 packages: above 60 C, Ptot derates linearly with 4.5 mW/K.

8. Recommended operating conditions

Table 5.	Recommended operating conditions
Symbol	Parameter	Conditions	Min	Typ	Max	Unit
74HC244
VCC	supply voltage		2.0	5.0	6.0	V
VI	input voltage		0	-	VCC	V
VO	output voltage		0	-	VCC	V
t/ V	input transition rise and fall rate	VCC = 2.0 V	-	-	625	ns/V
		VCC = 4.5 V	-	1.67	139	ns/V
		VCC = 6.0 V	-	-	83	ns/V
Tamb	ambient temperature		40	-	+125	C
74HC_HCT244	All information provided in this document is subject to legal disclaimers.				© NXP B.V. 2012. All rights reserved.

Product data sheet

Rev. 4 — 24 September 2012

4 of 18

NXP Semiconductors							74HC244; 74HCT244
									Octal buffer/line driver; 3-state
Table 5.		Recommended operating conditions …continued
Symbol		Parameter		Conditions				Min		Typ	Max		Unit
74HCT244
VCC		supply voltage						4.5	5.0		5.5		V
VI		input voltage						0	-		VCC		V
VO		output voltage						0	-		VCC		V
t/ V		input transition rise and fall rate		VCC = 4.5 V				-	1.67		139		ns/V
Tamb		ambient temperature						40	-		+125		C
9. Static characteristics
Table 6.		Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol		Parameter	Conditions			25 C		40 C to +85 C			40 C to +125 C			Unit
					Min	Typ	Max	Min		Max	Min		Max
74HC244
VIH		HIGH-level	VCC = 2.0 V		1.5	1.2	-	1.5	-		1.5		-	V
		input voltage
			VCC = 4.5 V		3.15	2.4	-	3.15	-		3.15		-	V
			VCC = 6.0 V		4.2	3.2	-	4.2	-		4.2		-	V
VIL		LOW-level	VCC = 2.0 V		-	0.8	0.5	-	0.5		-		0.5	V
		input voltage
			VCC = 4.5 V		-	2.1	1.35	-	1.35		-		1.35	V
			VCC = 6.0 V		-	2.8	1.8	-	1.8		-		1.8	V
VOH		HIGH-level	VI = VIH or VIL
		output voltage
			IO = 20 A; VCC = 2.0 V		1.9	2.0	-	1.9	-		1.9		-	V
			IO = 20 A; VCC = 4.5 V		4.4	4.5	-	4.4	-		4.4		-	V
			IO = 20 A; VCC = 6.0 V		5.9	6.0	-	5.9	-		5.9		-	V
			IO = 6.0 mA; VCC = 4.5 V		3.98	4.32	-	3.84	-		3.7		-	V
			IO = 7.8 mA; VCC = 6.0 V		5.48	5.81	-	5.34	-		5.2		-	V
VOL		LOW-level	VI = VIH or VIL
		output voltage
			IO = 20 A; VCC = 2.0 V		-	0	0.1	-	0.1		-		0.1	V
			IO = 20 A; VCC = 4.5 V		-	0	0.1	-	0.1		-		0.1	V
			IO = 20 A; VCC = 6.0 V		-	0	0.1	-	0.1		-		0.1	V
			IO = 6.0 mA; VCC = 4.5 V		-	0.15	0.26	-	0.33		-		0.4	V
			IO = 7.8 mA; VCC = 6.0 V		-	0.16	0.26	-	0.33		-		0.4	V
II		input leakage	VI = VCC or GND;		-	-	0.1	-		1.0	-		1.0	A
		current	VCC = 6.0 V
IOZ		OFF-state	per input pin; VI = VIH or VIL;		-	-	0.5	-		5.0	-		10	A
		output current	VO = VCC or GND;
			other inputs at VCC or GND;
			VCC = 6.0 V; IO = 0 A
ICC		supply current	VI = VCC or GND; IO = 0 A;		-	-	8.0	-	80		-		160	A
			VCC = 6.0 V
CI		input			-	3.5	-	-	-		-		-	pF
		capacitance
74HC_HCT244			All information provided in this document is subject to legal disclaimers.								© NXP B.V. 2012. All rights reserved.

Product data sheet

Rev. 4 — 24 September 2012

5 of 18

NXP Semiconductors								74HC244; 74HCT244
												Octal buffer/line driver; 3-state
Table 6.	Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol	Parameter	Conditions			25 C					40 C to +85 C					40 C to +125 C				Unit
				Min	Typ			Max		Min			Max		Min		Max
74HCT244
VIH	HIGH-level	VCC = 4.5 V to 5.5 V		2.0	1.6		-		2.0			-			2.0	-			V
	input voltage
VIL	LOW-level	VCC = 4.5 V to 5.5 V		-	1.2		0.8		-			0.8			-	0.8			V
	input voltage
VOH	HIGH-level	VI = VIH or VIL; VCC = 4.5 V
	output voltage
		IO = 20 A		4.4	4.5		-		4.4			-			4.4	-			V
		IO = 6 mA		3.98	4.32		-		3.84			-			3.7	-			V
VOL	LOW-level	VI = VIH or VIL; VCC = 4.5 V
	output voltage
		IO = 20 A		-	0		0.1		-			0.1			-	0.1			V
		IO = 6.0 mA		-	0.16		0.26		-			0.33			-	0.4			V
II	input leakage	VI = VCC or GND;		-	-			0.1	-				1.0		-		1.0		A
	current	VCC = 5.5 V
IOZ	OFF-state	per input pin; VI = VIH or VIL;		-	-			0.5	-				5.0		-		10		A
	output current	VO = VCC or GND;
		other inputs at VCC or GND;
		VCC = 5.5 V; IO = 0 A
ICC	supply current	VI = VCC or GND;		-	-		8.0		-			80			-	160			A
		VCC = 5.5 V; IO = 0 A
ICC	additional	per input pin;		-	70		252		-			315			-	343			A
	supply current	VI = VCC 2.1 V;
		other inputs at VCC or GND;
		VCC = 4.5 V to 5.5 V;
		IO = 0 A
CI	input			-	3.5		-		-			-			-	-			pF
	capacitance
10. Dynamic characteristics
Table 7.	Dynamic characteristics
GND = 0 V; for load circuit see Figure 8.
Symbol	Parameter		Conditions						25 C					40 C to +125 C				Unit
							Min			Typ		Max			Max		Max
														(85 C)		(125 C)
74HC244
tpd	propagation delay nAn to nYn;				[1]
			see Figure 6
			VCC = 2.0 V				-		30			110			145	165		ns
			VCC = 4.5 V				-		11			22			28	33		ns
			VCC = 5.0 V; CL = 15 pF				-		9			-			-	-		ns
			VCC = 6.0 V				-		9			19			24	28		ns

74HC_HCT244

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2012. All rights reserved.

Product data sheet

Rev. 4 — 24 September 2012

6 of 18