ATMEL AT16646G-20YC, AT16646G-20XC, AT16646F-25YC, AT16646F-25XC Datasheet

AT16646

Features

∙Fastest Propagation Speeds in the Industry TPD (F grade) = 2.5 ns, TPD (G grade) = 2.0 ns

∙Maximum derating for capacitive loads 1.5ns/100 pF (F grade) and 1.1ns/100 pF (G grade)

∙Very low ground bounce < 0.6 V @ VCC=5.00 V, Ta=25°C

∙Typical output skew ≤0.25ns

∙Bus Hold circuitry to retain last active state during Tri-State™

∙Available in SSOP and TSSOP packages

Description

Atmel’s AT16646 devices are 16-bit high speed, low power Tri-statable D type registers, ideal for use in systems requiring both transparent and registered mode functions. They are organized as two separate 8-bit bus transceivers. Data flow is bi-directional, and can be controlled for multiplexed transmission between A bus and B bus either directly or from the D registers by use of the direction control pin (xDir), output enable (xOE), and select lines (xSAB and xSBA). Storage of data on the A bus and B bus is controlled by the output pins. They have very low ground bounce and excellent input noise rejection, giving the user stable signals in a high speed environment. The Bus Hold feature eliminates the need for pull-up or pull-down resistors and retains the last active state during a Tri-State event.

Functional Block Diagram

Pin Configurations																																					SSOP/TSSOP
																															1DIR
Pin Names							Descriptions																										1CLKAB				1		2	56			55	1CLKBA 1OE
																															1SAB			GND			3		4	54			53	GND			1SBA
																															1A1			1A2			5		6	52			51	1B2			1B1
																															VCC						7			50							VCC
xDir, xOE							Output Enable Inputs																											1A3					8				49	1B3
																															1A4						9			48							1B4
																																		1A5					10				47	1B5
xCLKAB,xCLKBA							Clock Pulse Inputs																								GND			1A6			11		12	46			45	1B6			GND
																															1A7			1A8			13		14	44			43	1B8			1B7
																															2A1
xSAB, xSBA							Output Data Source Select Inputs																											2A2			15		16	42			41	2B2			2B1
																															2A3			GND			17		18	40			39	GND			2B3
xAχ							Data Register A Inputs																								2A4						19			38							2B4
																																		2A5					20				37	2B5
							Data Register B Outputs																								2A6			VCC			21		22	36			35	VCC			2B6
																															2A7			2A8			23		24	34			33	2B8			2B7
																															GND						25			32							GND
xBχ							Data Register B Inputs																											2SAB					26				31	2SBA
																															2CLKAB			2DIR			27		28	30			29				2CLKBA
																																												2OE
							Data Register A Outputs

Top View

AT16646 Fast Logic™

16-Bit Tri-State™

Register

AT16646F

AT16646G

0757B

5-21

Function Table(1)

					Inputs				Data I/O(2)		Operation or Function
xOE			xDir	xCLKAB		xCLKBA	xSAB	xSBA	xAχ	xBχ
	H		X	H or L		H or L	X	X	Input	Input	Isolation
	H		X	−		−	X	X			Store A and B Data
	L		L	X		X	X	L	Output	Input	Real Time B Data to A Bus
	L		L	X		H or L	X	H			Stored B Data to A Bus
	L		H	X		X	L	X	Input	Output	Real Time A Data to B Bus
	L		H	H or L		X	H	X			Stored A Data to B Bus
Notes:			1. H = High voltage level, L = Low voltage level, X = Don’t care, − = Low-to-High transition

2.The data output functions may be enabled or disabled by various signals at the xOE or xDir inputs. Data input functions are always enabled, i.e. data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.

Absolute Maximum Ratings*

Operating Temperature........................	0°C to +70°C
Storage Temperature ......................	-65°C to +150°C
Voltage on any Pin	-2.0 V to +7.0 V(1)
with Respect to Ground.................
Maximum Operating Voltage..............................	6.0V

5.0 Volt DC Characteristics

*NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Notes: 1. Minimum voltage is -0.6 V dc which may undershoot to -2.0 V for pulses of less than 20 ns. Maximum output pin voltage is VCC +0.75 V dc which may overshoot to +7.0 V for pulses of less than 20 ns.

Applicable over recommended operating range from Ta = 0°C to +70°C, V CC = +5.0V +/- 5% (unless otherwise noted)

Symbol		Parameter	Test Conditions	Min	Typ	Max	Units
ICC		Quiescent Power Supply	VCC = Max, VIN = 3.4 V		0.8	1.2	mA
		Current
VIH		Input High Voltage		2.0			V
VIL		Input Low Voltage				0.8	V
IIH		Input High Current (I/O Pins)	VIN = VCC			±15	μA
IIL		Input Low Current (I/O Pins)	VIN = GND			±15	μA
IOZ		Output Leakage Current				±10	μA
VOH(1)		Output High Voltage	VCC = 4.75 V	2.7			V
		F Grade only	IOH = -10 mA
VOH(2)		Output High Voltage	VCC = 4.75 V	2.7			V
		G Grade only	IOH = -12 mA
VOL		Output Low Voltage (F Grade)	IOL = 10 mA			0.55	V
VOL		Output Low Voltage (G Grade)	IOL = 12 mA			0.55	V
Note: 1.	F grade: At VCC (max), the value of VOH(max) = 3.75 V and at VCC(min), VOH(max) = 3.25 V
2.	G grade: At VCC (max), the value of VOH(max) = 3.75 V and at VCC(min), VOH(max) = 3.35 V

5-22	AT16646